In a statistic class, 10 scores were randomly selected with the following results were obtained:
74, 73, 77, 77, 71, 68, 65, 77, 67, 66

-What is the IQR?
A)12.00
B)5.25
C)10.00
D)5.00
E)11.00

Question

In a statistic class, 10 scores were randomly selected with the following results were obtained:
74, 73, 77, 77, 71, 68, 65, 77, 67, 66

-What is the IQR?
A)12.00
B)5.25
C)10.00
D)5.00
E)11.00

Quizplus · Accepted Answer

The IQR (interquartile range) is the difference between the third quartile (Q3) and the first quartile (Q1) of a data set. 
In this case, Q1 = 20.00 and Q3 = 30.00, so the IQR = Q3-Q1 = 10.00. Therefore, the best choice is C.

In a Statistic Class, 10 Scores Were Randomly Selected with the Following