Donations Organizers of a televised fundraiser know from past experience that most people donate small amounts ($10–$25), some donate larger amounts ($50– $100), and a few people make very generous...

Donations Organizers of a televised fundraiser know from past experience that most people donate small amounts ($10–$25), some donate larger amounts ($50– $100), and a few people make very generous donations of $250, $500, or more. Historically, pledges average about $32 with a standard deviation of $54.

 a) If 120 people call in pledges, what are the mean and standard deviation of the total amount raised?

b) What assumption did you make in answering the question in part a?

 c) The organizers are worried that people are pledging less than normal. How low would the 120-person total need to be to convince you that this is the case?