A public interest group hire students to solicit donations by telephone. After a brief

training period student make calls to potential donors and are paid on a commission

basis.Experienceindicatesthatearlyonthesestudentstendtohaveonlymodest

success and that 70% of them give up their jobs in their first 2 weeks of employment.

The group hires six students, which can be viewed as a random sample.

a.What is the expected number of students that will give up in the first 2 weeks

of employment?

b.What is the probability that exactly five of the six will give up in the first 2

weeks?

c.What is the probability that at least two of the six will give up in the first 2

weeks?

d.What is the probability that at least three of the six will not give up in the first

2 weeks?