The mean of grouped data is:
A) exactly equal to the midpoint of the interval.
B) the sum of the frequencies of the intervals.
C) the sum of the products of the intervals.
D) a reasonable approximation.

Question

Quizplus · Accepted Answer

The mean of grouped data is a reasonable approximation and is found by computing the weighted average of the midpoints of the intervals, where the weights are the frequencies of the intervals. The answer is not A, as the mean may not always be exactly equal to the midpoint of the interval. The answer is not B or C, as the sum of frequencies or products of intervals do not give the mean of the data.

The Mean of Grouped Data Is