In 2014, Jack in the Box® restaurants conducted a game called the Munchie Peel Instant Win Game® where you could peel a sticker off one of their meal boxes and possibly win a prize. They claimed that customers had a 1 in 4 chance of winning some sort of prize in this contest. 

a. If you buy four meals that have these stickers, what is the probability that you will have exactly one winner? 

b. If you buy four meals that have these stickers, what is the probability that you will have at least one winner? 

c. Suppose you plan to keep buying meals until you get a winner. What is the probability that you will have to buy four meals until you get a winner? 

d. Suppose you plan to keep buying meals until you get a winner. What is the probability that you will have to buy four or fewer meals until you get a winner? 

e. A friend buys four meal boxes and does not get a winner. Should she be upset?