In the notation below, X is the random variable, E and V refer to ...

[anshika]

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.

[jlaineee]

Answer to Question 1

D

Answer to Question 2

B

[anshika]

Excellent

[nguyenhoanhat]

Gracias!