5.37 Through April 30 of the 2009 filing season, 15.8%

of all individual U.S. tax returns were prepared by H&R Block. Source: H&R Block, Inc., Fast Facts 2009.

a. If two individuals are randomly selected from those filing tax returns during this period, what is the probability that both of their tax returns were prepared by H&R Block?

b. In part (a), what is the probability that neither return was prepared by H&R Block?

c. In part (a), what is the probability that exactly one of the two returns was prepared by H&R Block?