Author Question: In the notation below, X is the random variable, E and V refer to the expected value and variance, ... (Read 42 times)

anshika · **on:** Aug 1, 2018

In the notation below, X is the random variable, E and V refer to the expected value and variance, respectively. Which of the following is false?
a. E(3X) = 3E(X) c. E(X + 1) = E(X) + 1
b. V(2) = 0 d. All of these choices are true.

Question 2

The owner of a meat market has an assistant who has determined that the weights of roasts are normally distributed, with a mean of 3.2 pounds and standard deviation of 0.8 pounds. If a sample of 25 roasts yields a mean of 3.6 pounds, what is the Z-score for this sample mean?
a. -2.50 c. -0.50
b. 2.50 d. None of these choices.