In Exercise 11.6.15 about the Munchie Peel Instant Win Game®: 

a. What is the expected number of winning stickers for those that buy four meals? 

b. What is the standard deviation for the number of winning stickers for those who buy four meals? 

c. What is the expected number of meals one would have to buy in order to get exactly one winning sticker?

Data from Exercise 11.6.15

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.