4.6 Exercise 39

On average, Pierre, an amateur chef, drops three pieces of eggshell into every two cake batters he makes. Suppose that you buy one of his cakes.

1. In words, define the random variable X.
2. List the values that X may take on.
3. Give the distribution of X. X ~ _____(_____,_____)
4. On average, how many pieces of eggshell do you expect to be in the cake?
5. What is the probability that there will not be any pieces of eggshell in the cake?
6. Let’s say that you buy one of Pierre’s cakes each week for six weeks. What is the probability that there will not be any eggshell in any of the cakes?
7. Based upon the average given for Pierre, is it possible for there to be seven pieces of shell in the cake? Why?