The boxplots below display the distribution of maximum speed by type of roller coaster for a data set of 145 roller coasters in the United States.
-For steel roller coasters, the interquartile range (IQR) is equal to
A) 10 mph.
B) 20 mph.
C) 70 mph.
D) 95 mph.

Question

The boxplots below display the distribution of maximum speed by type of roller coaster for a data set of 145 roller coasters in the United States. 
-For steel roller coasters, the interquartile range (IQR) is equal to
A) 10 mph. 
B) 20 mph. 
C) 70 mph. 
D) 95 mph.

Quizplus · Accepted Answer

The interquartile range (IQR) is a measure of statistical dispersion, and in this context, it is given as 20 mph for steel roller coasters.

The Boxplots Below Display the Distribution of Maximum Speed by Type