The probability that a student entering a university will graduate is 0.4. Find out the probability that out of 3 students of the university:

1. non will graduate

2. only one will graduate

3. All will graduate

We have p = 0.4

∴q = 1 − p = 1 − 0.4 = 0.6

Let X denote the number of students entering a university who will graduate. Thus, X is a binomial variate with the parameter n = 3 and p = 0.4.

The probability that r students entering a university will graduate is given by:

(a) P(None will graduate) =

(b) P(Only one will graduate) =

(c) P(All will graduate) =