Suppose that 50% of all young adults prefer McDonald's to Burger King when asked to state a preference. A group of 10 young adults were randomly selected and their preferences recorded.
a. What is the probability that more than 6 preferred McDonald's?
b. What is the probability that between 4 and 6 (inclusive) preferred McDonald's?
c. What is the probability that between 4 and 6 (inclusive) preferred Burger King?