The Pew Internet & American Life Project found that nearly 70% of “wired” senior citizens go online every day. In a randomly selected group of 15 “wired” senior citizens:
a. What is the probability that more than four will say they go online every day?
b. What is the probability that exactly 10 will say that they go online every day?
c. What is the probability that fewer than 10 will say that they go online every day?