Quiz 6A.2 AP Statistics
Name:
1. The probabilities that a randomly selected customer purchases 1, 2, 3, 4 or 5 items at a
convenience store are 0.15, 0.17, 0.31, 0.10, and 0.27 respectively.
(a) Construct a probability distribution (table) for the data, and verify that this is a legitimate
probability distribution
(b) Calculate Hz. Interpret this value in the context of this problem.
(c) Find the standard deviation of X
(d) Suppose two customers, A and B, are selected at random. Find the mean and standard
deviation of the difference in the number of items purchased by A and by B. Show your work.
I ONLY NEED D