A public interest group hire students to solicit donations by telephone. After a briefing training period, students make calls to potential donors and are paid on a commission basis. Experience...

A public interest group hire students to solicit donations by telephone. After a briefing training period, students make calls to potential donors and are paid on a commission basis. Experience indicates that early on, these students tend to have only modest success and that 70% of them give up their jobs in their first two weeks of employment. The group hires six students, who can be viewed as a random sample.

1. Find the mean, variance and standard deviation.


2. What is the probability that more than three of the six will give up in the first two weeks?