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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) 20.00
B) 19.99
C) 10.50
D) 3 to 23

Answer :

Final answer:

To find the frequency distribution class width, subtract the lowest data point from the highest and divide that by the number of desired classes. In this case, that would be (183-3)/9 = 20. Therefore, option A) 20.00 is the most appropriate class width.

Explanation:

In order to find an appropriate class width for a frequency distribution, one must subtract the lowest data point from the highest and then divide the result by the desired number of classes. In this case, the shortest waiting time is 3 minutes and the longest time is 183 minutes. If we subtract 3 from 183, we get 180. Divide 180 by 9 (the number of desired classes), we get a class width of 20. Therefore, option A) 20.00 would be the most appropriate class width for this frequency distribution.

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