A researcher gives IQ tests to a large group of adults, and discovers that the
mean, median and mode all equal 100. The highest score in the group was 130
and the lowest was 70. Between IQ's of 75 and 125, 80% of the group was found, and 50% were found between IQ's of 90 and 110. The shape of the graphed distribution was mesokurtic.
-The range was equal to
A) 60
B) 50
C) 20
D) 0

Question

A researcher gives IQ tests to a large group of adults, and discovers that the 
mean, median and mode all equal 100.  The highest score in the group was 130 
and the lowest was 70.  Between IQ's of 75 and 125, 80% of the group was found,  and 50% were found between IQ's of 90 and 110.  The shape of the graphed  distribution was mesokurtic.     
-The range was equal to
A) 60
B) 50
C) 20
D) 0

Quizplus · Accepted Answer

The range of a set of data is the difference between the highest and lowest values. Given the highest score is 130 and the lowest is 70, the range is 130 - 70 = 60.

A Researcher Gives IQ Tests to a Large Group of Adults