1 At a particular university it has been found that 20% of the students withdraw without

completing the introductory statistics course. Assume that 15 students have registered for the

course this quarter.

What is the probability that exactly 4 will withdraw?

What is the probability that more than 3 will withdraw?

a.

b.

2 High School students drop out at a rate of approximately 11%. If 20 students are chosen at

random, find the probability that:

a) No more than 4 students drop out.

b) At least 8 graduates

c) 15 stays in school and graduate