An instructor made a frequency table of the scores his students got on a test The midpoint of the last class interval is _________.
A) 90
B) 5
C) 95
D) 100
E) 50

Question

An instructor made a frequency table of the scores his students got on a test  The midpoint of the last class interval is _________.
A) 90 
B) 5 
C) 95 
D) 100 
E) 50

Quizplus · Accepted Answer

To find the midpoint of the last class interval, we need to know the class width and the lower limit of the last interval. We cannot determine the class width from the given frequency table, but we can see that the last class interval starts at a score of 90 and includes scores up to some upper limit. Since the midpoint is the average of the upper and lower limits of a class interval, we know that the midpoint of the last interval will be greater than 90.

Looking at the answer choices, only C) 95 is greater than 90, so it must be the correct answer.

An Instructor Made a Frequency Table of the Scores His