Probability question: An insurance company looks at its auto insurance customers and finds that (a) all insure at least one car, An insurance company looks at its auto insurance customers and finds that (a) all insure at least one car, (b) 85% insure more than one car, (c) 23% insure a sport car, (d) 17% insure more than one car, including a sport car. Find the probability that a customer selected at random insures exactly one car and it is not a sport car.

Using (c) and (d), we have that 23% - 17% = 6% of people insure exactly one car, which is a sports car.

Using (a) and (b), we see that 15% insure exactly one car.

Then, combining these results, we find that 15% - 6% = 9% insure only one car, which is not a sports car.