An ice cream stand reports that 12% of the cones they sell are "jumbo" size. You want to see what a
"jumbo" cone looks like, so you stand and watch the sales for a while. What is the probability that
The first jumbo cone is the fourth cone you see them sell?
A) 93%
B) 60%
C) 33%
D) 40%
E) 8%

Question

Quizplus · Accepted Answer

The probability that the first jumbo cone is the fourth cone sold follows a geometric distribution with p = 0.12. The probability is (0.88)^3 * 0.12 = 0.072, which is approximately 8%.

An Ice Cream Stand Reports That 12% of the Cones