11.5% of the population is 65 or older

11.5% of the population is 65 or older. Find the probability that the following number of persons selected at random from 50 people are 65 or older.

a) The probability that none are 65 or older?

b) The probability that exactly 3 are age 65 or older?

c) The probability that no more than 5 are age 65 or older?