Problem:
Business During the month of July, a home improvement store sold a great many air-conditioning units, but some were returned. The following table shows the probability distribution for the daily number of returns of air conditioning units sold in July: x 0 1 2 3 4 5 P(x) .55 .31 .08 .04 .01 .01.
Required:
Question: Find the expected number of returns per day.
Note: Provide support for rationale.