3 According to the New York Times, 53% of all persons in the U.S. population have at least

some college education. If 20 persons are selected at random, find the probability that:

a) Half of them have some college education

b) At least 5 do not have any college education

c) Fewer than 7 have some college education

4 According to Police records in a large metropolitan city, accidents occur at a rate of 2 per

hour. The number of car accidents follows a Poisson distribution. Find the probability that:

a) There are no accidents in 1 hour

b) There are more than 5 accidents in 3 hours

c) There are fewer than 3 accidents in 2 hours.

d)