### Home > INT1 > Chapter 10 > Lesson 10.1.1 > Problem 10-17

Mr. McGee is the manager of the washer and dryer department of an appliance store. He wants to estimate the probability that a customer who comes to his department will buy a washer or dryer. He collected the following data during one week:

Make a two-way table. Using Mr. McGee’s data, what is the probability that the next customer who comes to his department will purchase a washer or a dryer?

**purchased**

washer**did not purchase**

washer**purchased dryer**purchased washer row 1 blank

did not purchase washer row 1 blank

**right edge top****did not purchase dryer**purchased washer row 2 blank

did not purchase washer row 2

right edge bottom blank

**bottom edge left**bottom edge right blank

%. Make sure you know how to calculate this from your two-way table. Mr. McGee promises his sales people a bonus if they can increase the probability that the customers who buy washers also buy dryers. What is the probability that if a customer bought a washer, he or she also bought a dryer?

How many people purchased washers?

Of those who purchased washers, how many bought dryers?