A customer service center keeps track of the number of complaints received each day about one of their new products. The numbers of complaints received over the last 11
Day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The IQR for this sample of
Data is
A) 25.
B) 22.
C) 18.
D) 9.
E) 4.

Question

Quizplus · Accepted Answer

To find the IQR, first arrange the data in ascending order: 16, 17, 18, 18, 19, 19, 21, 22, 22, 23, 25. The median (Q2) is 19. The lower quartile (Q1) is the median of the first half: 18. The upper quartile (Q3) is the median of the second half: 22. IQR = Q3 - Q1 = 22 - 18 = 4.

A Customer Service Center Keeps Track of the Number of Complaints