please hep me with these 4 questions in math!!

Answer:

See below.

Step-by-step explanation:

a)

Since Y1, ..., Yn are independent and identically distributed, we have Y¯Bar ~ Exp(θ/n) and Y(1) ~ Exp(nθ).

b)

We want to find c1 and c2 such that E[T1] = θ and E[T2] = θ. We have E[Y(1)] = 1/θ and E[Y¯Bar] = θ/n, so setting T1 = c1Y(1) gives E[T1] = c1/θ = θ, and setting T2 = c2Y¯Bar gives E[T2] = c2θ/n = θ. Thus, c1 = θ^2 and c2 = n. To compare the MSE of T1 and T2, we compute,

MSE(T1) = V(T1) + [E(T1) - θ]^2

= V(θY(1)) + [θ - θ]^2

= θ^2V(Y(1))

= θ^2/θ^2

= 1

MSE(T2) = V(T2) + [E(T2) - θ]^2

= V(nY¯Bar) + [θ - θ]^2

= n^2V(Y¯Bar)/n^2

= V(Y¯Bar)/n

= (θ^2/n^2)(n/θ)

= θ^2/n

Since MSE(T2) < MSE(T1) for n > 1, T2 is the preferred estimator.

c)

Let Q(Y1, ..., Yn; θ) = 2nY(1)/θ. We have E[Q] = 2n/θ and V(Q) = 4n^2V(Y(1))/θ^2 = 4n^2/θ^2. To show that Q ~ Chi-squared(2), we need to show that Q has a gamma distribution with parameters k = 2 and θ = 1/2. We have,

fQ(q) = (1/θ^k)(q^(k-1) exp(-q/θ))/Γ(k) = (1/2^2)(q/2)exp(-q/2) = (1/4)q/2 exp(-q/2)

which is the pdf of a gamma distribution with k = 2 and θ = 1/2.

d)

To construct a two-sided 1 - α confidence interval for θ, we use the fact that 2nY(1)/Q(Y1, ..., Yn; θ) ~ F(2, 2n). Let Fα/2 be the (1 - α/2) quantile of the F distribution with 2 and 2n degrees of freedom. Then we have,

P(2nY(1)/(Fα/2) < θ < 2nY(1)/(F1-α/2)) = 1 - α

So the confidence interval is [2nY(1)/(Fα/2), 2nY(1)/(F1-α/2)].

Answer: it depends; if exam day, no

Step-by-step explanation:

Fionna and Anuar each had 349 cards, bringing the total to 417. Fionna alone had 145 cards.

A mathematical concept known as the unitary approach entails calculating the value of a single unit in order to calculate the value of a given quantity. Finding the value of one unit and utilising that value to determine the value of a given quantity is an approach for solving problems. For instance, you can use the unitary technique to determine the price of 10 apples if you know that 5 apples cost $10. Now, divide $10 by 5, which equals $2, to determine the price of one apple. The cost of 10 apples is then determined by multiplying the price of one apple ($2) by 10, giving you a final cost of $20.

given

145 total cards with Fionna

349 total cards with Fionna and Aura

Card count with Anuar: 349 - 145

= 204

Rizza's number of cards equals 1/3 of 204.

= 204 / 3

= 68

Total number of cards: 68, 204, and 145

= 417

Fionna and Anuar each had 349 cards, bringing the total to 417. Fionna alone had 145 cards.

To know more about unitary method visit:

https://brainly.com/question/28276953

#SPJ1

Answer:

180

Step-by-step explanation:

The gravitational waves would have traveled through a volume of approximately 3.244 x 10⁷⁴ cubic light-years.

The space-time continuum is subject to gravitational waves, which move at the speed of light. They are caused by the acceleration of large objects that distort space-time around them, such as neutron stars or black holes.

The bending of space-time brought on by the existence of mass and energy is what Einstein's theory of general relativity refers to as gravity rather than a force.

The radius of the sphere can be determined using the formula:

R = Distance / Time

For 1.3 billion light years we have:

R = Distance / Time = 1.239 x 10²⁵ meters

Substituting the value in the volume:

V = (4/3) x π x R³ = 3.244 x 10⁷⁴ cubic light-years (approx)

Hence, the gravitational waves would have traveled through a volume of approximately 3.244 x 10⁷⁴ cubic light-years.

Learn more about gravity here:

https://brainly.com/question/4014727

#SPJ1

We will use sine function, and length of the opposite side is [tex]\frac{25\sqrt{3}}{2}$[/tex] feet.

To solve for the opposite side of the right triangle, we would use the sine function. In a right triangle, the sine of an angle is defined as the ratio of the length of the opposite side to the length of the hypotenuse.

In this problem, we are given that one angle of the right triangle is 60 degrees and the hypotenuse is 25 feet. Let's label the opposite side as x and the adjacent side as y. Then we can use the sine function:

[tex]$\sin 60^\circ = \frac{x}{25}$[/tex]

Simplifying the left side, we have:

[tex]$\frac{\sqrt{3}}{2} = \frac{x}{25}$[/tex]

Multiplying both sides by 25, we get:

[tex]$x = \frac{25\sqrt{3}}{2}$[/tex]

Therefore, the length of the opposite side is [tex]\frac{25\sqrt{3}}{2}$[/tex] feet.

To know more about Function visit:

brainly.com/question/28193995

#SPJ1

The intercepts of the line are:

x-intercept: (3, 0)

y-intercept: (0, 1)

What are the intercepts?

To find the x-intercept, we need to find the point where the line intersects the x-axis. This occurs when the y-coordinate of the point is zero. From the given information, we know that the line passes through the point (3, 0), so this point must be the x-intercept.

Therefore, the x-intercept is (3, 0).

To find the y-intercept, we need to find the point where the line intersects the y-axis. This occurs when the x-coordinate of the point is zero. We can find the equation of the line using the two given points (0, y) and (3, 0):

Slope of the line = (y2 - y1) / (x2 - x1)

= (0 - y) / (3 - 0)

= -y / 3

Using the point-slope form of the equation of a line, y - y1 = m(x - x1), where m is the slope and (x1, y1) is a point on the line, we can write:

y - 0 = (-y/3)(x - 3)

Simplifying this equation, we get:

y = (-y/3)x + 1

Multiplying both sides by 3, we get:

3y = -yx + 3

Adding yx to both sides, we get:

yx + 3y = 3

This is the equation of the line in standard form. To find the y-intercept, we set x = 0:

0 + 3y = 3

Solving for y, we get:

y = 1

Therefore, the y-intercept is (0, 1).

Hence, the intercepts of the line are:

x-intercept: (3, 0)

y-intercept: (0, 1)

To know more about the intercepts, visit:

https://brainly.com/question/29113022

#SPJ1

Answer:

The total number of fruits Halston can choose is 3 + 4 + 2 = 9.

The number of ways she can choose two fruits without restrictions is 9C2 = (98)/(21) = 36.

The number of ways she can choose two fruits where both are bananas is 2C2 = 1.

Therefore, the number of ways she can choose two fruits that are not bananas is 36 - 1 = 35.

So, the probability that Halston chooses two fruits that are not bananas is:

35/36

Therefore, the probability that Halston chooses two fruits that are not bananas is 35/36.

The probability that a randomly selected car will get through the restaurant's drive-through in less than 101 seconds is  -1.3

What is normal distribution ?

Normal distribution, also known as Gaussian distribution or bell curve, is a continuous probability distribution that is commonly used in statistical analysis to model real-world phenomena. A normal distribution is characterized by its mean (μ) and standard deviation (σ), and is symmetrical around its mean. The bell-shaped curve of a normal distribution is determined by the empirical rule, also known as the 68-95-99.7 rule, which states that approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations. Many natural phenomena, such as human height and weight, tend to follow a normal distribution, and this makes normal distribution a useful tool in statistical analysis and modeling.

According to the question:
(a) To find the probability that a randomly selected car will get through the restaurant's drive-through in less than 101 seconds, we need to standardize the value using the formula:

z = (x - μ) / σ

where x is the value we are interested in, μ is the mean drive-through time, σ is the standard deviation, and z is the corresponding z-score.

Plugging in the values given, we get:

z = (101 - 137.5) / 27 = -1.3

Using a standard normal distribution table or a calculator, we find that the probability of getting a z-score less than -1.35 is 0.0885. Therefore, the probability that a randomly selected car will get through the restaurant's drive-through in less than 101 seconds is:

P(X < 101) = P(Z < -1.35) = 0.0885 (rounded to four decimal places).

(b) To find the probability that a randomly selected car will spend more than 176 seconds in the restaurant's drive-through, we again need to standardize the value:

z = (176 - 137.5) / 27 = 1.42

Using a standard normal distribution table or a calculator, we find that the probability of getting a z-score greater than 1.42 is 0.0788. Therefore, the probability that a randomly selected car will spend more than 176 seconds in the restaurant's drive-through is:

P(X > 176) = P(Z > 1.42) = 0.0788 (rounded to four decimal places).

(c) To find the proportion of cars that spend between 2 and 3 minutes (120 and 180 seconds) in the restaurant's drive-through, we need to standardize the values of the lower and upper limits:

z1 = (120 - 137.5) / 27 = -0.65

z2 = (180 - 137.5) / 27 = 1.57

Using a standard normal distribution table or a calculator, we find the area between these two z-scores to be 0.6591. Therefore, the proportion of cars that spend between 2 and 3 minutes in the restaurant's drive-through is:

P(120 < X < 180) = P(-0.65 < Z < 1.57) = 0.6591 (rounded to four decimal places).

(d) To find the probability that a car spends more than 3 minutes (180 seconds) in the restaurant's drive-through, we standardize the value:

z = (180 - 137.5) / 27 = 1.57

Using a standard normal distribution table or a calculator, we find that the probability of getting a z-score greater than 1.57 is 0.0582. Since this probability is less than 0.05, it would be considered unusual for a car to spend more than 3 minutes in the restaurant's drive-through.


To know more about normal distribution visit:
https://brainly.com/question/17199694
#SPJ1

Based on the information we can infer that the number of candy bars they buy depends on the number of guests you have.

To find the number of candy bars they are going to buy we need to look at the graph. In this case, if the maximum number of bars they are going to buy is 10 and the maximum number of people they are going to invite is 10, we can infer that 1 bar would correspond to each person.

Based on the above, we can infer that the relationship is directly proportional between the candy bars and the guests. In accordance with the above, the number of sweets depends on the number of guests.

Learn more about proportionality in: https://brainly.com/question/29126727

#SPJ1

If Yellow Sticker Business meets its operating income goal, the quarterly safety margin in dollars will be $4,583.33.

Budgeting, debt reduction, and setting up an emergency fund are important short-term objectives. Key insurance policies should be included in medium-term goals, whilst retirement should be the primary emphasis of long-term objectives.

Next, we deduct our break-even sales from actual sales at the goal operating income level to determine the margin of safety:

Real sales are determined by dividing target operating income by total fixed costs and contribution margin ratio.

Real sales equal $8,250 plus $15,000 / 0.60.

Real sales were $29,583.33

Safety margin = Real sales Breakeven sales

Margin of safety is calculated as $29,583.33 - ($0.50 x 50,000 units).

$25,000 - 29,583.33 is the margin of safety.

$4,583.33 is the safety margin.

To know more about income goal visit:

https://brainly.com/question/25760886

#SPJ1

Answer:2.04

Step-by-step explanation:

Answer:

Without additional information or context, it is not possible to find the value of x for the given diagrams. Please provide more information or the full problem statement.

Step-by-step explanation:

To solve the given equation, we can start by taking the square root of both sides of the equation:

(x – 7)^2 = 36

√((x – 7)^2) = ±√36

x – 7 = ±6

Now, we can solve for x by adding 7 to both sides of the equation for each case:

x – 7 = 6 or x – 7 = -6

x = 13 or x = 1

Therefore, the values of x that satisfy the equation are x = 13 and x = 1. The other values, x = -29 and x = 42, do not satisfy the equation.

Answer:

Based on the information in the table, the statement that best describes the customers' preferences on shirt colors is:

A. At both stores, more customers prefer white shirts than shirts in either of the other two colors.

Looking at the table, we can see that at store 1, 30 customers prefer white shirts, while only 20 prefer blue and 10 prefer black. Similarly, at store 2, 25 customers prefer white shirts, while only 15 prefer blue and 10 prefer black. Therefore, we can conclude that at both stores, more customers prefer white shirts than shirts in either of the other two colors.

Option B is incorrect because the table shows that at store 2, 20 customers prefer blue shirts while 10 prefer black shirts. Therefore, a different number of customers prefer blue and black shirts.

Option C is also incorrect because at both stores, more customers prefer white shirts than blue shirts, and the same number of customers prefer black and blue shirts.

Option D is incorrect because at store 1, only 10 customers prefer black shirts, while 20 prefer blue and 30 prefer white. Therefore, more customers prefer white or blue shirts than black shirts.

Answer:

Step-by-step explanation:

The simple interest formula is:

I = Prt

where I is the interest earned, P is the principal or initial investment, r is the annual interest rate as a decimal, and t is the time in years.

Substituting the given values:

P = $2,926

r = 0.64% = 0.0064 (as a decimal)

t = 19 years

I = 2,926 * 0.0064 * 19

I = $353.21

Therefore, Elisabeth will have earned $353.21 in interest after 19 years.

To assess the reasonableness of Cameron's statement that he spent about $215 on a gaming system and video games, we can use mental math to estimate the total cost.

We know that he spent $130 on a gaming system and $80 on video games. If we round $80 up to $100 and add it to $130, we get:

$130 + $100 = $230

So based on this estimate, it seems like Cameron's statement of spending about $215 is not entirely accurate. However, it is close to the actual total cost, which is within 10% of the estimated total.

Therefore, we can say that while Cameron's statement may not be entirely precise, it is reasonably close to the actual total cost and can be considered reasonable.

Let's assume,

We know that perimeter of triangle is sum of all the sides.

a + b + c = Perimeter

3x + 4x + 5x = 84

12x = 84

x = 84/12

x = 7

Hence,

Now,

Semi-perimeter = Perimeter/2

= 84/2

= 42 cm

Using heron's formula,

Where,

= √42(42- 21)(42 ; 28)(42- 35)

= √42( 21 × 14 × 7)

= √42 × 2058

= √ 86,436

= 294 cm²

Therefore, Area of the triangle is 294 cm²

Answer:

Step-by-step explanation:

Area of one base:

  [tex]A=\pi r^2=\pi (3.2)^2 =10.24\pi cm^2[/tex]

Perimeter of circle base:

  [tex]P=2\pi r=2\times \pi \times 3.2 =6.4 \pi cm[/tex]

Height of cylinder:

  [tex]h=8.7cm[/tex]       (given in question)

Total surface area:

[tex]SA=[/tex] area 2 circles + area rectangle

     [tex]=(2\times 10.24 \pi) +(6.4\pi\times 8.7)[/tex]           (Area rectangle = cylinder height x

                                                              circle perimeter)

     [tex]=239.26cm^2[/tex]

An equation to represent relationship of the weights shown on the scale include the following: 22 + x = 34.

Based on the information provided about the weights on this balanced scale, we can logically deduce the following parameters;

Each small square = 1 unit.

Each larger square = 10 units.

The variable x represent the weight of the triangle.

Since there are four small squares and three large squares each labeled ten on one side of this balanced scale, we have:

Total weight = 4(1) + 3(10)

Total weight = 34 units.

Similarly, there are two small squares, two large squares, and a triangle labeled x on the other side of this balanced scale, we have:

Total weight = 2(1) + 2(10) + x

Total weight = 22 + x

By equating the two equations, we have:

22 + x = 34

x = 34 - 22

x = 12

In conclusion, there are 34 units on each side of this balanced scale.

Read more on weight and squares here: https://brainly.com/question/25904604

#SPJ1

Answer: 6

Step-by-step explanation: We are told that the large cistern is completely filled shown with the larger volume. To find volume, the formula is lxwxh and if you apply that to the model, the larger cistern has a volume of 24 ft cubed which means 24 is completely filled. If we calculate the volume of the smaller cistern, it is 6. The question asks us how many cubic feet will be left when the larger cistern pours enough water to completely fill up the smaller cistern (24). So we do subtraction, 24-6= 18 meaning 18 is the number that is going to get poured from the big to the small cistern to make it 24 or, completely filled. And when we subtract the 18 from 24 (because we poured 18 from the large one to the small one to make it full), we get 6. 6 is how much is left after the larger cistern poured 18 to fill up the smaller cistern.

Answer:

85 degrees.

Step-by-step explanation:

These are parallelograms, meaning the opposite sides are parallel. Since they are parallel, that the line EA becomes a transversal and a bisector for the angle CEK. That means the angle 8 and 3 are equivalent and 7 and 4 are equivalent. This is due to Same Side Interior Angles. These are two halves of the big angle. If the halves are equal, so are the angles. Therefore, CEK = CAK.

The sum of the two functions  f(x) + g(x)  is  (x+2)/(x^2 - 9) + 11/(x^2 + 3x)

(a) To find f(x) + g(x), we simply add the two functions together:

f(x) + g(x) = (x+2)/(x^2 - 9) + 11/(x^2 + 3x)

(b) To determine the excluded values, we need to look for values of x that make the denominators of the two functions equal to zero. The denominators are:

x^2 - 9 and x^2 + 3x

Setting these equal to zero and solving for x, we get:

x^2 - 9 = 0 => x = ±3

x^2 + 3x = 0 => x(x+3) = 0 => x = 0 or x = -3

Therefore, the excluded values are x = ±3 and x = 0.

(c) To classify the type of discontinuity at each of the excluded values, we need to examine the behavior of the function as x approaches these values.

At x = ±3, the denominators of both functions become zero, which means that the function is undefined at these values. This creates a vertical asymptote, which is a type of infinite discontinuity.

At x = 0, the denominator of g(x) becomes zero, but the denominator of f(x) does not. This creates a removable discontinuity, because we can define f(0) separately to make the function continuous at this point. Specifically, we can set f(0) = 2/(-9) = -2/9 to remove the discontinuity.

Learn  more about functions below.

https://brainly.com/question/17043948

#SPJ1

Answer:

1-d

2-c

3-b

4-a

5-e

To match the quadratic equations to their answers, we need to solve each equation and compare the solutions with the given options. After solving each equation, the answers can be identified as a. x=5,-5; b. x=8,-8; c. x=1.2,-1.2; a. x=5,-5; e. x=4,-4.

To match the quadratic equations to their answers, we need to solve each equation and compare the solutions with the given options. Let's go through each equation:

https://brainly.com/question/34196754

#SPJ2

With the help of proportions in the given similar triangles we know that the value of x is 3.5 units.

Euclidean geometry states that two objects are comparable if they have the same shape or the same shape as each other's mirror image.

One can be created from the other more precisely by evenly scaling, possibly with the inclusion of further translation, rotation, and reflection.

These three theorems—Angle-Angle (AA), Side-Angle-Side (SAS), and Side-Side-Side (SSS)—are reliable techniques for figuring out how similar triangles are to one another.

So, in the given situation:

TR and WY are as follows:
TR/WU

24/2

2/1

Similarly,

TS/WV

2/1

7/x

7/3.5

Therefore, with the help of proportions in the given similar triangles we know that the value of x is 3.5 units.

Know more about triangle similarity here:

https://brainly.com/question/14285697

#SPJ1

Answer:

Lion area: 60

Lion Perimeter: 34

Tiger Area: 60

Tiger perimeter: 64

Step-by-step explanation:

Accοrding tο the standard nοrmal distributiοn, the prοbability that z is greater than -0.25 is 0.5987.

Nοrmal distributiοn, alsο knοwn as Gaussian distributiοn οr bell curve, is a prοbability distributiοn that describes the randοm variatiοn οf a cοntinuοus variable in a pοpulatiοn. In a standard nοrmal distributiοn, the mean is 0 and the standard deviatiοn is 1, and the curve is fully described by the parameters οf mean and standard deviatiοn. The nοrmal distributiοn is used in many statistical applicatiοns tο mοdel and analyze cοntinuοus data.

Using a standard nοrmal distributiοn table οr a calculatοr, we can find that the area tο the right οf z=-0.25 is apprοximately 0.5987.

Therefοre,

[tex]$$P(z > -0.25) = 1 - P(z \leq -0.25) = 1 - 0.4013 = 0.5987$$[/tex]

Sο the prοbability that z is greater than -0.25 is 0.5987.

To know more about standard normal distribution visit:

brainly.com/question/17199694

#SPJ1

Complete Question

Find P(Z > 0.25), using the standard normal distribution. The average number of calories in a 1.5-ounce chocolate bar is 250. Suppose that the distribution of calories is approximately normal with standard deviation 10. Find the probability that a randomly selected chocolate bar will have between 230 and 260 calories. A single die is rolled 5 times. Find the probability of getting at least one number which is greater than 4. Given data values: 11, 3, 5, 12, 17, 13, 10, 6, 8, 21, 14, 20, 9, 15, 7. (a) Find the percentile rank for 10. (b) What value corresponds to the 70th percentile? A survey found that the American family rates an average of 25 pounds of glass garbage each year. Assume the standard deviation of the distribution is 7pounds. Find the probability that the mean of a sample of 49 families will be between 19 and 26 pounds.

The probability of rolling an even number on a single die is 1/2, or 50%. This can be calculated by considering the possible outcomes of rolling the die.

There are six possible outcomes, and three of these are even numbers (2, 4, and 6). Therefore, there is a 3/6, or 1/2, chance of rolling an even number. In terms of probability, this can be expressed as a fraction, percentage, or decimal. As a fraction, the probability of rolling an even number on a single die is 3/6, or 1/2. As a percentage, the probability of rolling an even number on a single die is 50%. As a decimal, the probability of rolling an even number on a single die is 0.5. No matter how it is expressed, the probability of rolling an even number on a single die is 1/2, or 50%. This can be easily remembered by considering that there are six possible outcomes, and three of them are even numbers.

Learn more about probability here:

https://brainly.com/question/15124899

#SPJ1