It has been found that 10% of the people in a suburban town are allergic to ragweed.If 5 people of the town are selected at random, what is the...

It has been found that 10% of the people in a suburban town are allergic to ragweed.If 5 people of the town are selected at random, what is the probability that

1. exactly 2 of them are allergic to ragweed

2. exactly 3 of them are allergic to ragweed