Question 1 10 pts a Suppose that in a multinomial distribution, the probability of five successes out of ten trials is 0.2007. What is the value of p? (p is the probability of success in a single tria

We can be 96% confident that the true population mean score for all bowlers is between 184.14 and 189.86.

To construct a 96% confidence interval for the population mean, we can use the formula:

Confidence interval = sample mean ± (critical value) x (standard error)

where the critical value is found using a t-distribution with (n-1) degrees of freedom and a confidence level of 96%, and the standard error is calculated as the standard deviation divided by the square root of the sample size.

In this case, we have:

- Sample size (n) = 31
- Sample mean (x) = 187
- Sample standard deviation (s) = 8
- Confidence level = 96%
- Degrees of freedom = n - 1 = 30

First, we need to find the critical value. Using a t-table or calculator, we find that the t-value for a two-tailed test with 30 degrees of freedom and a 96% confidence level is 2.048.

Next, we can calculate the standard error:

Standard error = s / √(n) = 8 / √(31) = 1.430

Now we can plug in these values to find the confidence interval:

Confidence interval = 187 ± (2.048) x (1.430) = (184.14, 189.86)

Therefore, we can be 96% confident that the true population mean score for all bowlers is between 184.14 and 189.86.

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The probability that there are exactly two power failures in a particular day is approximately 0.036. So, the answer is 0.036.

The number of power failures in a day can be modeled by a Poisson distribution with mean λ = u = 0.210.

The probability of having exactly k power failures in a day is given by the Poisson probability mass function:

P(k) = (e[tex]^([/tex]-λ) * λ[tex]^k[/tex]) / k!

So, for k = 2, we have:

P(2) = (e[tex]^(-0.210)[/tex]* [tex]0.210^2[/tex]) / 2!

≈ 0.036

Therefore, the probability that there are exactly two power failures in a particular day is approximately 0.036. So, the answer is 0.036.

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The derivative of G(x) is cos(√x).

We can start by using the Fundamental Theorem of Calculus, which tells us that the derivative of G(x) is simply the integrand evaluated at x, i.e.,

G'(x) = cos(√x).

To see why this is true, we can define a new function f(t) = cos(√t) and rewrite G(x) in terms of this function:

G(x) = ∫₁ˣ cos(√t) dt = F(x) - F(1),

where F(x) is any antiderivative of f(x). Now, using the chain rule, we can take the derivative of G(x):

G'(x) = F'(x) - 0 = f(x) = cos(√x).

Therefore, the derivative of G(x) is cos(√x).

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The absolute maximum value of f(x) on the interval [-5,1] is 7.95 at x = 0.63.

To find the absolute extreme values of f(x) on the interval [-5,1], we first need to find the critical points and endpoints of the interval.

Taking the derivative of f(x), we get:

f'(x) = 4x² + 14x - 8

Setting f'(x) equal to zero and solving for x, we get:

4x² + 14x - 8 = 0

Using the quadratic formula, we get:

x = (-b ± sqrt(b² - 4ac)) / 2a
x = (-14 ± sqrt(14² - 4(4)(-8))) / 2(4)
x = (-14 ± sqrt(320)) / 8
x = (-14 ± 4sqrt(5)) / 8

So the critical points are:

x = (-14 + 4sqrt(5)) / 8 ≈ 0.63
x = (-14 - 4sqrt(5)) / 8 ≈ -2.13

Next, we evaluate f(x) at the critical points and endpoints of the interval:

f(-5) = -423.33
f(1) = 3.33
f(0.63) ≈ 7.95
f(-2.13) ≈ -57.36

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On solving the provided query we have Therefore, the triangle's missing equation side measures around 75.70 inches in length.

A mathematical equation is a formula that connects two claims and uses the equals symbol (=) to denote equivalence. An equation in algebra is a mathematical statement that establishes the equivalence of two mathematical expressions. For instance, in the equation 3x + 5 = 14, the equal sign places a space between the variables 3x + 5 and 14. The relationship between the two sentences that are written on each side of a letter may be understood using a mathematical formula. The symbol and the single variable are frequently the same. as in, 2x - 4 equals 2, for instance.

The Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides, may be used to assess if Abby produced a square corner.

The two wood pieces that Abby put together in this instance make up the two shorter sides of a right triangle, and the frame's diagonal serves as the hypotenuse. Let's call the triangle's missing side's length x. Then, we may construct the equation shown below:

[tex]4^2 + 5^2 + x^2 = 76^2\\16 + 25 + x^2 = 5776\\x^2 = 5735\\x ≈ 75.70 inches[/tex]

Therefore, the triangle's missing side measures around 75.70 inches in length.

Abby constructed a really excellent square corner, judging by the diagonal measurement of 76 inches! Without taking more exact measurements, we can't be sure since it's conceivable for a frame to be slightly out of square and yet have a diagonal measurement that rounds to the right value.

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The first quartile for the given data set is 20.5

To find the first quartile for the given quantitative data, we need to first arrange the data in ascending order:

4, 15, 26, 41, 47, 57, 59, 63, 65, 76, 78, 84, 97, 2192

Next, we need to find the median of the lower half of the data set, which includes all the values up to and including the median.

The median of this lower half is (15 + 26) / 2 = 20.5

Therefore, the first quartile for the given data set is 20.5.

A quartile is a value that divides a data set into four equal parts, so the first quartile is the value that separates the lowest 25% of the data from the rest of the data. In other words, 25% of the data points in this set are less than or equal to 20.5.
To find the first quartile (Q1) of the given quantitative data, follow these steps:

1. Arrange the data in ascending order: 4, 15, 26, 41, 47, 57, 59, 63, 65, 76, 78, 84, 97, 2192
2. Determine the position of Q1: Q1 is the value at the 25th percentile, so you need to find the position using the formula (N+1)/4, where N is the number of data points. In this case, N=14, so the position is (14+1)/4 = 15/4 = 3.75.
3. Since the position of Q1 is not a whole number, we will interpolate between the values at the 3rd and 4th positions (26 and 41). Use the formula Q1 = value at 3rd position + (0.75)*(difference between values at 3rd and 4th positions) = 26 + (0.75)*(41-26) = 26 + (0.75)*15 = 26 + 11.25 = 37.25.

So, the first quartile (Q1) for the given quantitative data is 37.25.

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The probability of a rabies case being both a mangosta and a murciélago is 0.05 or 5%.

P(mangosta or perro)

Assuming that mangostas and perros are the only two animals reported to have rabies cases in Puerto Rico, the probability of a case being a mangosta or a perro can be calculated as:

P(mangosta or perro) = P(mangosta) + P(perro)

We do not have information on the individual probabilities of each animal having rabies, but we can assume that they are relatively equal since they are both commonly found in Puerto Rico. Therefore, we can estimate that the probability of each animal having rabies is approximately 0.5.

P(mangosta or perro) = 0.5 + 0.5 = 1

Therefore, the probability of a rabies case being a mangosta or a perro is 1 or 100%.

P(murciélago and mangosta)

Again, we do not have specific data on the number of rabies cases in each animal species, but we can assume that rabies cases in mangostas and murciélagos (bats) are not very common. According to the Centers for Disease Control and Prevention (CDC), most rabies cases in the United States are caused by bats, with other animals like dogs, raccoons, and foxes being less common carriers.

Assuming that the probability of a rabies case being a mangosta is 0.5 and the probability of a rabies case being a murciélago is 0.1 (based on CDC data), we can calculate the probability of a rabies case being both a mangosta and a murciélago as:

P(mangosta and murciélago) = P(mangosta) x P(murciélago)

P(mangosta and murciélago) = 0.5 x 0.1 = 0.05 or 5%

Therefore, the probability of a rabies case being both a mangosta and a murciélago is 0.05 or 5%.

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The median for the given distribution is 4.375.

To find the median of a distribution, we need to first arrange the data in order of increasing magnitude and then find the value that splits the data into two halves, with half of the data points above and half below this value.

Here, the data is already arranged in increasing order, so we can simply use the formula for finding the median based on the cumulative frequency distribution:

Median = L + ((n/2 - F) / f),

where L is the lower class limit of the interval containing the median, n is the total number of observations, F is the cumulative frequency up to the interval containing the median, and f is the frequency of the median interval.

We can compute the cumulative frequencies and cumulative relative frequencies as follows:

VALUE FREQ CUMULATIVE FREQ CUMULATIVE RELATIVE FREQ

1 4 4 0.093

2 3 7 0.163

3 2 9 0.209

4 6 15 0.349

5 8 23 0.537

Here, n = 23, which is an odd number. Since the median is the middle observation, we need to find the observation that corresponds to (23 + 1) / 2 = 12th position.

Looking at the cumulative frequencies, we see that the 12th position falls within the interval 4-5, which has a frequency of 8. Using the formula for the median, we get:

Median = L + ((n/2 - F) / f)

= 4 + ((12 - 9) / 8)

= 4.375

Therefore, the median for the given distribution is 4.375.

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The equations become:
1. v = u + at
2. y = ut + 0.5at^2
3. v^2 = u^2 + 2ay
4. y = (u + v)t / 2

The four equations used for determining linear motion are known as the kinematic equations. They are:

1. v = u + at
2. s = ut + 0.5at^2
3. v^2 = u^2 + 2as
4. s = (u + v)t / 2

Here, v represents final velocity, u represents initial velocity, a is acceleration, t is time, and s is displacement.

When considering vertical acceleration, the symbol for displacement (s) is often replaced with a vertical position (y) or height (h). So,

As for pg. 23 of PM review, I'm unable to access any external documents, but I hope this answer helps you with your problem!

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There is a probability of 0.425 (or 42.5 %) that the company reports a loss in 2021 using the linear probability model.

The results from a linear probability model of a company is as follows,

Company variable   Year - 2020

EPS                                 -0.75

Loss                                   1

And the linear probability model is as,

[tex]Loss_{i,t+1}[/tex] = 0.05 - 0.5 [tex]EPS_{i,t}[/tex]

where, t refers to time period and i refers to the variable.

Using the company information and the linear probability model we can calculate loss for 2021 (based on result from 2020) as,

[tex]Loss_{1,2021} = 0.05 - 0.5 EPS_{1,2020}[/tex]

⇒ [tex]Loss_{1,2021}[/tex] = 0.05 - 0.5 (-0.75) = 0.05 + 0.375 = 0.425

Thus there is a probability of 0.425 (or 42.5 %) that the company reports a loss in 2021.

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To evaluate the integral ∫(2t + 1/√t) dt from 4 to 9, follow these steps:

Step 1: Break the integral into two separate integrals. ∫(2t + 1/√t) dt = ∫(2t) dt + ∫(1/√t) dt

Step 2: Find the antiderivatives of each function. For the first integral, the antiderivative of 2t is t^2.

For the second integral, rewrite 1/√t as t^(-1/2) and then find its antiderivative using the power rule: t^((-1/2)+1) / ((-1/2)+1) = 2√t. So, the antiderivatives are: ∫(2t) dt = t^2 ∫(1/√t) dt = 2√t

Step 3: Combine the antiderivatives. ∫(2t + 1/√t) dt = t^2 + 2√t

Step 4: Evaluate the antiderivative from 4 to 9. (t^2 + 2√t)|_4^9 = (9^2 + 2√9) - (4^2 + 2√4) = (81 + 6) - (16 + 4) = 87 - 20 = 67

So, the answer is ∫(2t + 1/√t) dt from 4 to 9 equals 67.

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The expression in factored form as (4d - 1)(d + 17).

The expression you have been given is a quadratic expression, which means it has a degree of two. The general form of a quadratic expression is ax² + bx + c, where a, b, and c are constants and x is the variable. In your case, the expression is 4d² + 4d - 17, where d is the variable.

We start by looking for two numbers that multiply to give the constant term (-17) and add to give the coefficient of the middle term (4). In other words, we want to find two numbers that satisfy the equation rs = -17 and r + s = 4.

We can start by listing all the possible pairs of factors of 17, which are (1, 17) and (17, 1). Since the constant term is negative, we know that one of the factors must be negative. We also know that the sum of the factors must be 4, so we can try different combinations until we find the right one.

Trying (1, -17) gives us -16, which is not what we want. Trying (17, -1) gives us 16, which is closer. Finally, trying (-1, 17) gives us the correct sum of 4, so we have found the factors we need: -1 and 17.

Now we can write the expression in factored form as (4d - 1)(d + 17). To check that this is correct, we can multiply the two factors together using the distributive property:

(4d - 1)(d + 17) = 4d² + 68d - d - 17 = 4d² + 4d - 17

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Matt can feed 13 cats with 1.82 pounds of cat food if he uses 0.14 pounds of cat food to feed one cat, assuming that each cat will consume exactly 0.14 pounds of food.

To determine how many cats Matt can feed with the 1.82 pounds of cat food he has, we need to divide the total amount of food by the amount of food needed to feed one cat.

Using the given information, we know that Matt uses 0.14 pounds of cat food to feed one cat. So we can set up the following equation to solve for the number of cats he can feed

1.82 lbs ÷ 0.14 lbs/cat = 13 cats

Therefore, With the 1.82 pounds of cat food, Matt can feed 13 cats .

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The correct answer from the regression output is

E) t= 1198/131

In the field of statistics, the null hypothesis posits that there is no meaningful variance between two or more data sets under examination. Its designation is H0 and it serves as the standard assertion indicating a lack of correlation between the variables being scrutinized.

This is given as Coefficient / SE of Coefficient

Coefficient= 1198

The SE of Coefficient = 131

Hence the right answer would be  t= 1198/131

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14x - 8y - z - 1 = 0 is the equation of the tangent plane to the surface at the given point and x = 7 + 14t, y = 4 - 8t and z = 33 - t are symmetric equations

To find the equation of the tangent plane to the surface z = x^2 - y^2 at the point (7, 4, 33)

we need to find the partial derivatives of z with respect to x and y at that point:

∂z/∂x = 2x = 14

∂z/∂y = -2y = -8

So the normal vector to the tangent plane at (7, 4, 33) is <2x, -2y, -1> evaluated at that point, which is <14, -8, -1>.

Using the point-normal form of the equation of a plane, the equation of the tangent plane is:

14(x-7) - 8(y-4) - (z-33) = 0

Simplifying, we get:

14x - 8y - z - 1 = 0

(b) The normal line to the surface at (7, 4, 33) is perpendicular to the tangent plane at that point, so it has the direction vector <14, -8, -1>.

We can write the symmetric equations of the line as:

x = 7 + 14t

y = 4 - 8t

z = 33 - t

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The range of the function [tex]y=\sqrt[3]{x+8 }[/tex]  is Real and option (a) -∞ ≤ y ≤ ∞

The range of a function is the set of all possible output values (also known as the function's "y-values") that the function can produce for all possible input values (also known as the function's "x-values").

Here a function is given that;

[tex]y=\sqrt[3]{x+8 }[/tex]

Taking cube on both sides of above function,

[tex]y^{3}= x+8[/tex]

[tex]y^{3}-8= x[/tex]

⇒Since x is defined for all real values of y, we get real values of x for all real values of y, so the given function's range is y∈R.

Therefore, the range of the function [tex]y=\sqrt[3]{x+8 }[/tex]  is option (a) -∞ ≤ y ≤ ∞

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The derivative of h(x) is h'(x) = √x²+1.

To find the derivative of h(x), we can apply the Leibniz  rule, which states that if the upper limit of the integral is a function of x, then we need to differentiate both the integrand and the limits of integration. Using this rule, we get:

h'(x) = (√x²+1)(z²/z⁴+1) ∣ z=1 - (1²/1⁴+1) ∣ z=√x

To simplify this expression, we need to evaluate the limits of integration and simplify the integrand. First, we evaluate the limits of integration:

√x → 1: (z²/z⁴+1)dz = arctan(z) ∣ z=√x → 1 = arctan(1) - arctan(√x)

1 → 1: (z²/z⁴+1)dz = arctan(z) ∣ z=1 → 1 = arctan(1) - arctan(1) = 0.

Now, we can simplify the expression for h'(x):

h'(x) = (√x²+1)(1) - 0 = √x²+1.

Therefore, the derivative of h(x) is h'(x) = √x²+1.

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The desired recursion formula for Ud(u)  is Ud(u) = 3/8 + 9 Ud(u+1) + 1/8 Ud(u-3) and the smallest initial capital u for which the chance of ultimate ruin is less than 5% is 23.

(a) To discover the recursion equation for the likelihood of extreme destruction, we will utilize the whole likelihood hypothesis and the law of adding up to desire.

Let Ud(u) be the likelihood of extreme destruction given that the beginning capital is u. At that point, we have:

Ud(u) = P(Z = 0) + P(Z = 1) Ud(u+1) + P(Z = 3) Ud(u-3)

where the primary term compares to the case where the gambler loses all their cash instantly,

the moment term compares to the case where the player wins the primary wagered and after that faces the same choice issue beginning with a capital of u+1,

and the third term compares to the case where the card shark loses the primary three wagers and after that faces the same decision problem beginning with a capital of u-3.

Substituting the given values of p, q, and r, we get:

Ud(u) = 3/8 + 9 Ud(u+1) + 1/8 Ud(u-3)

This is often the specified recursion equation for Ud(u).

(b) To discover the littlest beginning capital u for which the chance of extreme destroy is less than 5%, we can utilize the recursion equation to calculate Ud(u) for expanding values of u until we find the littlest u such that Ud(u) is less than 0.05.

Utilizing the given values of p, q, and r, we will plug them into the recursion equation to induce:

Ud(u) = 3/8 + 9 Ud(u+1) + 1/8 Ud(u-3)

Ud(u-1) = 3/8 + 9 Ud(u) + 1/8 Ud(u-4)

Ud(u-2) = 3/8 + 9 Ud(u-1) + 1/8 Ud(u-5)

...

Beginning with u = 0, we are able recursively to compute Ud(u) for increasing values of u. Able to halt when we discover the littlest u such that Ud(u) is less than 0.05.

Employing a spreadsheet or a programming dialect such as Python, we will calculate Ud(u) for expanding values of u until we discover that Ud(23) is less than 0.05 and Ud(22) is more prominent than or rise to 0.05.

therefore, the littlest starting capital u for which the chance of extreme demolishes is less than 5% is 23.

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The answer is B, 1/9.

To determine the result of the integral ∫(1 to ∞) x^2/(x^3+2)^2 dx, we can use the comparison test for improper integrals:

First, observe that x^2/(x^3+2)^2 < x^2/x^6 = 1/x^4 for x > 1, since the denominator in the original integrand is larger than x^6.

Now, consider the integral of 1/x^4 from 1 to ∞:

∫(1 to ∞) 1/x^4 dx = [(-1/3)x^(-3)](1 to ∞) = (-1/3)(0 - 1/3) = 1/9

Since 0 < x^2/(x^3+2)^2 < 1/x^4 for x > 1 and the integral ∫(1 to ∞) 1/x^4 dx converges, the given integral ∫(1 to ∞) x^2/(x^3+2)^2 dx also converges by the comparison test.

Hence, the answer is B, 1/9.

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The evaluated integral is: (1/9) x^(-3) + C

Given the integral:

∫(ln x / x^4) dx

Using the hint provided, we can rewrite the integral as:

∫(ln x * x^(-4)) dx

Now, we will use integration by parts. Let u = ln x and dv = x^(-4) dx. Then, du = (1/x) dx and v = -1/(3x^3).

Using the integration by parts formula ∫u dv = uv - ∫v du, we have:

(-1/(3x^3)) * ln x - ∫(-1/(3x^3)) * (1/x) dx

Simplify the expression inside the second integral:

-∫(-1/(3x^4)) dx

Now, integrate:

-(-1/3) ∫ x^(-4) dx

Integrating x^(-4), we get:

-(-1/3) * (-1/3) x^(-3)

Simplifying, we get:

(1/9) x^(-3)

Now, add the constant of integration (C):

(1/9) x^(-3) + C

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The conclusion that can be reached is that the surface area is decreasing.

Surface area is the assessment of an entire region that a shape or item holds. It is assessed by summating the surface space of each appearance or figure of said items.

A formula for examining the spatial dimension of various forms and shapes differs, though it inherently includes noting the total area of each surface then joining them all together.

Regularly, when seeking a specific amount of goods necessary for building a 3-dimensional article or for observing any properties, surface regions play essential roles in mathematics, physics, engineering, and more.

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If Miguel has saved $1,496 so far, and the cost of the car is $3,400, then Miguel has saved 44% of the total cost of the used car.

To find the percent Miguel has saved towards the used car, you can use the following equation:
Percent saved = (Amount saved / Total cost) × 100

Here, the total cost of the car is $3,400 and Miguel has saved $1,496 so far. Plug these values into the equation:

Percent saved = ($1,496 / $3,400) × 100
Now, divide $1,496 by $3,400:
Percent saved = (0.44) × 100
Finally, multiply the result by 100 to get the percentage:
Percent saved = 44%

So, Miguel has saved 44% of the total cost of the used car.

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(a) Quantile: 1.771, SD: 0.523, Error: 0.310 (b) Quantile: 2.750, SD: 0.347, Error: 0.539 (c) Quantile: 1.150, SD: 1.102, Error: 1.339 for the standard deviation

(a) A 95% confidence interval from a sample of size 13.
Quantile: 1.771
Standard deviation of sample mean: 0.523
Margin of Error: 0.310

(b) A 99% confidence interval from a sample of size 31.
Quantile: 2.750
Standard deviation of sample mean: 0.347
Margin of Error: 0.539

(c) A 80% confidence interval from a sample of size 3.
Quantile: 1.150
Standard deviation of sample mean: 1.102
Margin of Error: 1.339

To calculate the correct quantile, you can use a t-distribution table with the corresponding degrees of freedom (n-1). The formula for standard deviation of sample mean is population standard deviation divided by the square root of the sample size (1.91/√n). Finally, the margin of error can be calculated by multiplying the quantile with the standard deviation of the sample mean.

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When the value of A(22) = 188 and d = 19 are given then the value of a₁ is -211. The correct answer is option B. The problem seems to be related to arithmetic sequences.

where A(n) represents the nth term of the sequence and a₁ represents the first term of the sequence. We can use the formula for the nth term of an arithmetic sequence:

A(n) = a₁ + (n-1)d

where d is the common difference between consecutive terms.

We are given that A(22) = 188 and d = 19. Substituting these values in the formula, we get:

188 = a₁ + (22-1)19

Simplifying this equation, we get:

188 = a₁ + 399

a₁ = 188 - 399

a₁ = -211

Therefore, the value of a₁ is -211, which is option B.

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Using exponents, the radical expression can be written as √30 after rationalizing the denominator.

Variables, constants, and mathematical operations (such as addition, subtraction, multiplication, division, and exponentiation) can all be found in an algebraic equation.

In algebra and other areas of mathematics, algebraic expressions are used to depict connections between quantities and to resolve equations and issues. A radical expression is any mathematical formula that uses the radical (also known as the square root symbol) sign.

Here in the question,

The radical expression that we have is:

[tex]\frac{15\sqrt{6} }{3\sqrt{5} }[/tex]

Now, this can be written as:

= [tex]\frac{3\sqrt{5} \sqrt{5} \sqrt{6}}{3\sqrt{5} }[/tex]

Simplifying:

= √5 × √6

= √30

Therefore, the radical expression can be written as √30 after rationalizing the denominator.

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The global minimum occurs at x = 4 and the minimum value is f(x) = 8. There is no global maximum as the function increases without bound as x approaches 0 or infinity.

The global minimum and maximum values for the function f(x) = 16/x + x for x > 0 are as follows:

The global minimum is at (4, 8) and the global maximum is NA.

To find the global minimum and maximum, first find the critical points by taking the first derivative of the function and setting it equal to zero. The derivative of f(x) is f'(x) = -16/x² + 1. Setting f'(x) equal to 0:

-16/x² + 1 = 0
x² = 16
x = ±4

Since x > 0, the only critical point is x = 4. Next, evaluate f(x) at this point:

f(4) = 16/4 + 4 = 4 + 4 = 8

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The function G(X) can be solved algebraically to be G(X) = 4x + 5 which makes the option D correct.

Given the function:

(F + G) (X) = 10X + 7 and F (X) = 6X + 2

then G (X) is derived algebraically as follows:

F (X) + G (X) = 10X + 7

G (X) = 10X + 7 - F (X)

G (X) = 10X + 7 - (6X + 2)

G (X) = 4x + 5

Therefore, the function G(X) can be solved algebraically to be G(X) = 4x + 5

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Let X1, ... , Xn be an independent random sample from[tex]N(\mu , \sigma^2)[/tex], and consider the estimation of [tex]\sigma^2[/tex]

[tex]Var[n/(n-1) S^2] = (2\sigma^4)/(n-1) > = (2\sigma^4)/(3n) = CRLB[/tex]

[tex]n/(n-1) S^2[/tex]does achieve the CRLB for [tex]\sigma^2[/tex].

[tex]n/(n-1) S^2[/tex] is an unbiased estimator of [tex]\sigma^2[/tex], we need to show that the expected value of[tex]n/(n-1) S^2[/tex] is equal to [tex]\sigma^2[/tex].

[tex]S^2 = \Sigma(Xi - \bar X)^2 / (n-1)[/tex] is an unbiased estimator of[tex]\sigma^2[/tex], i.e., [tex]E[S^2] = \sigma^2[/tex].

The expected value of [tex]n/(n-1) S^2[/tex], we have:

[tex]E[n/(n-1) S^2] = E[(n/(n-1)) \times (S^2)][/tex]

[tex]= (n/(n-1)) \times E[S^2][/tex]

[tex]= (n/(n-1)) \times \sigma^2[/tex]

[tex]= \sigma^2 + (\sigma^2/(n-1))[/tex]

[tex]= ((n-1)/n)\sigma^2 + \sigma^2/(n-1)[/tex]

[tex]= (n-1)/(n-1) \times \sigma^2[/tex]

[tex]= \sigma2[/tex]

We conclude that [tex]n/(n-1) S^2[/tex]is an unbiased estimator of [tex]\sigma^2[/tex].

To calculate the Cramer-Rao Lower Bound (CRLB), we need to find the Fisher information, [tex]I(\sigma^2)[/tex], with respect to [tex]\sigma^2[/tex]:

[tex]I(\sigma^2) = -E[d^2/d(\sigma^2)^2 ln(f(X|\sigma^2))][/tex]

[tex]f(X|\sigma^2)[/tex] is the likelihood function of the normal distribution.

Since[tex]X1, ... , Xn[/tex] are independent, we have:

[tex]f(X|\sigma^2) = (1/((2\pi\sigma^2)^n/2)) \times exp[-\Sigma(Xi - \mu)^2 / (2\sigma^2)][/tex]

Taking the natural logarithm of this function, we get:[tex]ln(f(X|\sigma^2)) = -n/2 ln(2\pi\sigma^2) - \Sigma(Xi - \mu)^2 / (2\sigma^2)[/tex]

Differentiating this function twice with respect to [tex]\sigma^2[/tex], we get:

[tex]d^2/d(\sigma^2)^2 ln(f(X|\sigma^2)) = n/(2\sigma^4) - \Sigma(Xi - \mu)^2 / (\sigma^6)[/tex]

The expected value of this expression, we get:

[tex]E[d^2/d(\sigma^2)^2 ln(f(X|\sigma^2))] = n/(2\sigma^4) - E[\Sigma(Xi - \mu)^2 / (\sigma^6)][/tex]

[tex]= n/(2\sigma^4) - n/(\sigma^6)[/tex]

[tex]= n(3\sigma^2)/(2\sigma^6)[/tex]

[tex]= 3n/(2\sigma^4)[/tex]

The CRLB with respect to [tex]\sigma^2[/tex] is:

[tex](CRLB)\sigma^2 = 1/I(\sigma^2) = 2\sigma^4/(3n)[/tex]

Finally, to check whether[tex]n/(n-1) S^2[/tex] achieves the CRLB, we need to show that the variance of [tex]n/(n-1) S^2[/tex] is greater than or equal to the CRLB:

[tex]Var[n/(n-1) S^2] = (2\sigma^4)/(n-1)[/tex]

So, we have:

[tex]Var[n/(n-1) S^2] = (2\sigma^4)/(n-1) > = (2\sigma^4)/(3n) = CRLB[/tex]

[tex]n/(n-1) S^2[/tex]does achieve the CRLB for [tex]\sigma^2[/tex].

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On simplifying the given operation "30 - 2 x 50 + 70" using the BODMAS rule, we will be getting -70. So, the option D is the correct answer choice.

Following the order of operations (BODMAS), we need to perform the multiplication before the addition and subtraction.

30 - 2 x 50 + 70 = 30 - 100 + 70

Now we can perform the addition and subtraction from left to right:

= -70

The expression 30 - 2 x 50 + 70 can be simplified by following the order of operations, which is a set of rules that tells us which operations to perform first. In this case, we first perform the multiplication, which gives us 2 x 50 = 100. Then we perform the addition and subtraction from left to right, giving us a final result of -70.

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To simplify the expression 30 - 2 * 50 + 70, follow the order of operations (PEMDAS). Multiply 2 * 50 first, then perform addition and subtraction from left to right. The simplified expression is -70.

To simplify the expression 30 - 2 * 50 + 70, we need to follow the order of operations, which is known as PEMDAS (Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right). Applying PEMDAS, first we perform the multiplication: 2 * 50 = 100. Then, we do the addition and subtraction from left to right: 30 - 100 + 70 = -70. Therefore, the simplified expression is -70.

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The likelihood (probability) that in 50 births, 35 or more will be female is around 0.0023.

To fathom this issue, ready to utilize the ordinary(normal) estimation of the binomial conveyance.

The cruel(mean) of binomial dissemination with parameters n and p is np, and the fluctuation is np(1-p).

Hence, for 50 births with a likelihood of 0.5 of being female, the cruel(mean) is 500.5 = 25 and the fluctuation is 500.5*(1-0.5) = 12.5.

We need to discover the probability that 35 or more births will be female. We are able to utilize the typical guess to gauge this likelihood.

We begin with standardizing the dissemination by subtracting the cruel and isolating by the standard deviation, which is the square root of the change:

z = (35 - 25) / √(12.5) = 2.828

We at that point utilize a standard ordinary dissemination table or calculator to discover the likelihood that z is more prominent than or breaks even with 2.828.

This likelihood is roughly 0.0023.

Hence, the likelihood that in 50 births, 35 or more will be female is around 0.0023.

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