Many Walmart stores have automotive departments where customers can buy tires, have their vehicles serviced, and obtain other automotive services. Recently, the manager at an Ohio Walmart 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 appropriate class width, subtract the smallest value in the data set from the largest value and then divide by the number of classes desired. Here, (183 - 3) / 9 = 180 / 9 = 20. Therefore, a class width of 20.00 is appropriate.

Many Walmart Stores Have Automotive Departments Where Customers Can Buy