In the calculation of a mean for grouped data,___________ are used.
A)Total sample size and sum of the midpoints of each class
B)Total sample size and sum of the weighted midpoints
C)Sum of the frequency of each class and the sum of the midpoints of each class
D)Sum of the frequency of each class and the sample midpoint

Question

Quizplus · Accepted Answer

In the calculation of a mean for grouped data, we need to use the weighted midpoints of each class. The weighted midpoint of a class is the midpoint of the class multiplied by its frequency. We also need to use the total sample size, which is the sum of the frequencies of each class. Therefore, the best choice is B, which includes both the total sample size and the sum of the weighted midpoints.

In the Calculation of a Mean for Grouped Data,___________ Are