5. Determine whether or not each of the following is a Binomial random variable. If it is not a Binomial random variable, provide a short explanation.

a) You roll a die 20 times. Let X be the number of 3's that you roll.

b) The San Jose State football team will play 12 games next season. They have a 70% chance of winning each conference game and a 60% chance of winning each non-conference game. Let X be the number of games they win next season.

c) Evelyn has a 75% chance of getting an A in each class she takes. Let X be the number of A's Evelyn earns during four years at SJSU.