Question

Find the variance of the random variable in Exercise 54 of Chapter Four. 54. A committee...

Find the variance of the random variable in Exercise 54 of Chapter Four.

54. A committee is to consist of 50 randomly chosen United States senators. Find the expected number of different states to be represented on the committee.

Answer: 3.15689

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Find the variance of the random variable in Exercise 51 of Chapter Four. 51. Four letters...
Find the variance of the random variable in Exercise 51 of Chapter Four. 51. Four letters are drawn, one at a time, from WALLA WALLA. What is the expected number of different letters to be drawn?
A sociologist randomly selects single adults for different groups of four, and the random variable x...
A sociologist randomly selects single adults for different groups of four, and the random variable x is the number of adults in the group who say that the most fun way to flirt is in person. (Based on a Messaging Survey) x p(x) 0 0.092 1 0.159 2 0.357 3 0.320 4 0.072 Answer the following questions and make sure you apply the round-off rule and units correctly: (a) Does the table describe a probability distribution? Why yes or why...
1. Twelve individuals want to form a committee of four. (a.) How many committees are possible?...
1. Twelve individuals want to form a committee of four. (a.) How many committees are possible? (b.) The 12 individuals consist of 5 biologists, 4 chemists, and 3 physicists. How many committees consisting of 1 biologist, 1 chemist, and 2 physicists are possible? (c.) In the setting of part (b), if all committees are equally as likely, what is the probability the committee formed will consist of 1 biologist, 1 chemist, and 2 physicists? 2. You are out of town...
Find the mean, variance, and standard deviation of the random variable having the probability distribution given...
Find the mean, variance, and standard deviation of the random variable having the probability distribution given in the following table. (Round your answers to four decimal places.) Random variable, x -7 -6 -5 -4 -3 P(X = x) 0.13 0.16 0.4 0.15 0.16
i) A random variable X has a binomial distribution with mean 6 and variance 3.6: Find...
i) A random variable X has a binomial distribution with mean 6 and variance 3.6: Find P(X = 4). ii) Let X equal the larger outcome when a pair of four-sided dice is rolled. The pmf of X is f(x) = (2x - 1/ 16) ; x = 1; 2; 3; 4. Find the mean, variance and standard deviation of X. iii) Let μ and σ^2 denote the mean and variance of the random variable able X. Determine E [(X...
Chapter 7, Section 2, Exercise 032 Find the expected count and the contribution to the chi-square...
Chapter 7, Section 2, Exercise 032 Find the expected count and the contribution to the chi-square statistic for the (C,F) cell in the two-way table below. D E F G Total A 35 31 43 33 142 B 78 92 66 54 290 C 15 35 29 27 106 Total 128 158 138 114 538 Round your answer for the expected count to one decimal place, and your answer for the contribution to the chi-square statistic to three decimal places....
Three students answer a true-false question on a test randomly. A random variable x represents the...
Three students answer a true-false question on a test randomly. A random variable x represents the number of answers of true among the three students, taking on the value 0, 1, 2, or 3. (a) Find the frequency distribution for x. (b) Find the probability distribution for x. For the same random variable x as the previous problem, find the following: (a) The expected value (b) The variance (c) The standard deviation
The random variable x is the number of people who have a college degree in a...
The random variable x is the number of people who have a college degree in a randomly selected group of four adults from a particular town. Its probability distribution is given in the table. Find the mean and variance of the random variable x. X 0 1 2 3 4 p(x) 0.13 0.34 0.25 0.16 0.12
Using the expected value and variance of a random variable X~Bin(n,p), find an expression for E(X^2)...
Using the expected value and variance of a random variable X~Bin(n,p), find an expression for E(X^2) in terms of n and p.
Mean, Variance and Standard Deviation of a Continuous Random Variable 37. Consider the density function (?)=3?...
Mean, Variance and Standard Deviation of a Continuous Random Variable 37. Consider the density function (?)=3? 2 on the interval [0,1]. Find the expected value E(X), the variance Var(X) and the standard deviation σ(X) for the density function and round your answers to four decimal places [Clearly state the method you used and how you calculated your result if you used the calculator] 38.Find the median of the random variable with the probability density function given in question 37 round...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT