Question

The pmf of the amount of memory X (GB) in a purchased flash drive is given...

The pmf of the amount of memory X (GB) in a purchased flash drive is given as the following.

x 1 2 4 8 16
p(x)        0.05     0.15     0.30     0.45     0.05  

(a) Compute E(X). (Enter your answer to two decimal places.)
GB

(b) Compute V(X) directly from the definition. (Enter your answer to four decimal places.)
GB2

(c) Compute the standard deviation of X. (Round your answer to three decimal places.)
GB

(d) Compute V(X) using the shortcut formula. (Enter your answer to four decimal places.)
GB2

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. For a discrete distribution the pmf = x/10   for x = 1, 2, 3, 4....
1. For a discrete distribution the pmf = x/10   for x = 1, 2, 3, 4. What is the expected value for this distribution? Give your answer to four decimal places. 2. The pmf for a discrete distribution is given by p(x) = 1/3 for x = -1, 0, 1. What is the variance of this distribution? Give your answer to four decimal places. 3. You have invented a new procedure for which the outcome can be classified as either...
Consider the probability distribution shown below. x 0 1 2 P(x) 0.65 0.30 0.05 Compute the...
Consider the probability distribution shown below. x 0 1 2 P(x) 0.65 0.30 0.05 Compute the expected value of the distribution. Compute the standard deviation of the distribution. (Round your answer to four decimal places.)
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by a certain plant has a standard beta distribution with α = 5 and β = 4. (a) Compute E(X) and V(X). (Round your answers to four decimal places.) E(X) = V(X) = (b) Compute P(X ≤ 0.4). (Round your answer to four decimal places.) (c) Compute P(0.4 ≤ X ≤ 0.8). (Round your answer to four decimal places.) (d) What is the expected proportion...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by a certain plant has a standard beta distribution with α = 5 and β = 2. (a) Compute E(X) and V(X). (Round your answers to four decimal places.) E(X) = V(X) = (b) Compute P(X ≤ 0.4). (Round your answer to four decimal places.) (c) Compute P(0.4 ≤ X ≤ 0.8). (Round your answer to four decimal places.) (d) What is the expected proportion...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by a certain plant has a standard beta distribution with α = 4 and β = 2. (a) Compute E(X) and V(X). (Round your answers to four decimal places.) E(X) = V(X) = (b) Compute P(X ≤ 0.5). (Round your answer to four decimal places.) (c) Compute P(0.5 ≤ X ≤ 0.8). (Round your answer to four decimal places.) (d) What is the expected proportion...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by...
Suppose the proportion X of surface area in a randomly selected quadrat that is covered by a certain plant has a standard beta distribution with α = 4 and β = 2. (a) Compute E(X) and V(X). (Round your answers to four decimal places.) E(X) = 0.6667 V(X) = 0.0317 (b) Compute P(X ≤ 0.2). (Round your answer to four decimal places.) (c) Compute P(0.2 ≤ X ≤ 0.5). (Round your answer to four decimal places.) (d) What is the...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table. y p(x, y)    0 5 10 15 x 0 0.03 0.06 0.02 0.10 5 0.04 0.15 0.20 0.10 10 0.01 0.15 0.13 0.01 (a)...
Consider the probability distribution shown below. x 0 1 2 P(x) 0.05 0.50 0.45 Compute the...
Consider the probability distribution shown below. x 0 1 2 P(x) 0.05 0.50 0.45 Compute the expected value of the distribution. Consider a binomial experiment with n = 7 trials where the probability of success on a single trial is p = 0.10. (Round your answers to three decimal places.) (a) Find P(r = 0). (b) Find P(r ≥ 1) by using the complement rule. Compute the standard deviation of the distribution. (Round your answer to four decimal places.) A...
You are given the probability distribution below: x 0 1 2 3 4 p(x) 0.05 0.35...
You are given the probability distribution below: x 0 1 2 3 4 p(x) 0.05 0.35 0.25 0.20 0.15 Determine the standard deviation of X. Report your answer to three decimal places.
Scientists claim eating chocolate can improve memory. So to test this theory 10 subjects were given...
Scientists claim eating chocolate can improve memory. So to test this theory 10 subjects were given a memory test in which they had to remember 25 items with and without having eaten chocolate. The results were as follows: Subject A B C D E F G H I J Without Chocolate 18 16 21 23 14 15 14 19 20 22 With Chocolate 20 17 23 21 16 18 13 23 22 20 What is the p-value? Round answer to...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT