(p. 176). Recall that the researchers exposed supermarket customers to two different ambient scents—chocolate chip cookie (the indulgent scent) and strawberry (the non-indulgent scent)—then classified all purchases as either healthy (e.g., fish, fruit), unhealthy (e.g., candy, ice cream), or neutral/nonfood. Under the non-indulgent scent, the probability of a healthy purchase is .45. Under the indulgent scent, the probability of a healthy purchase is .30.

a. For a random sample of 300 purchases made under the non-indulgent scent, what is the probability that more than 200 purchases are healthy?

b. For a random sample of 300 purchases made under the indulgent scent, what is the probability that more than 200 purchases are healthy?