The following data represent the wait time, in minutes, for customers calling Dell technical support. (See the Excel Data File.) The interquartile range is ________.
A) 7 minutes
B) 9 minutes
C) 10 minutes
D) 12 minutes

Question

The following data represent the wait time, in minutes, for customers calling Dell technical support.  (See the Excel Data File.) The interquartile range is ________.
A) 7 minutes 
B) 9 minutes 
C) 10 minutes 
D) 12 minutes

Quizplus · Accepted Answer

The first quartile is 11 and the third quartile is 20, so the interquartile range is 20-11 = 9 minutes. Therefore, the best choice is B.

The Following Data Represent the Wait Time, in Minutes, for Customers