Suppose that past history shows that 60% of college students prefer Brand C cola. A sample of 5 students is to be selected.
a) The probability that exactly one prefers brand C is ________.
b) The probability that at least one prefers brand C is ________.
c) The probability that more than three prefer brand C is ________.
d) The average number that you would expect to prefer brand C is ______.
e) The variance of the number that prefer brand C is ________.