7.10 Suppose that fund-raisers at a university call recent graduates to request donations for campus outreach programs. They report the following information for last year’s graduates:

Size of donation $0 $10 $25 $50 Proportion of calls 0.45 0.30 0.20 0.05 Three attempts were made to contact each graduate.

A donation of $0 was recorded both for those who were contacted but who declined to make a donation and for those who were not reached in three attempts.

Consider the variable x 5 amount of donation for the population of last year’s graduates of this university.

a. Write a few sentences describing what you think you might see if the value of x was observed for each of 1000 graduates.

b. What is the most common value of x in this population?

c. What is P(x $ 25)?

d. What is P(x . 0)?