Answer the question in Problem 19 assuming that you are in the audience and want the probability that the contestant will win the car you have selected.

Data from Problem 19

The following problem appeared in an "Ask Marilyn" column, by Marilyn Vos Savant:

There are five cars on display as prizes, and their five ignition keys are in a box. You get to pick one key out of the box and try it in the ignition of one car. If it fits, you win the car. What are your chances of winning a car?