According to a recent survey, outside of their own family members, 26% of adult Americans have no

Question:

According to a recent survey, outside of their own family members, 26% of adult Americans have no close friend to confide in. If this is the prevailing probability today, find the probability that in a random sample of n = 5 adults
(a) Two or more have no close friend.
(b) At most two have no close friend.
(c) Find the expected number of persons who have no close friend.