Many Wal-Mart stores have automotive departments where customers can buy tires,have their vehicles serviced,and obtain other automotive services.Recently,the manager at an Ohio Wal-Mart collected data on the time customers had to wait to get the desired automotive service.Of the 500 cars in the sample,the shortest time any customer spent waiting was 3 minutes and the longest time was 183 minutes.Assuming that the manager wishes to develop a frequency distribution with 9 classes,which of the following would be an appropriate class width for each class?
A)10.50
B)19.99
C)20.00
D)3 to 23

Question

Quizplus · Accepted Answer

To find the class width, subtract the shortest time from the longest time (183 - 3 = 180) and divide by the number of classes (9). This gives a class width of 20.

Many Wal-Mart Stores Have Automotive Departments Where Customers Can Buy