When approximating descriptive measures for grouped data, the sample mean can be obtained by making the assumption that the midpoint of each class closely approximates the mean of each class.

Question

Quizplus · Accepted Answer

This is true since the sample mean is calculated by summing up the product of the midpoint of each class and its frequency, and dividing it by the total frequency of all classes. This assumes that the midpoint is a good approximation for the mean of each class.

When Approximating Descriptive Measures for Grouped Data, the Sample Mean