Which of the Following Statements Is True

Multiple Choice

Which of the following statements is true?

A) When approximating the sample mean for grouped data we assume that the midpoint of each class closely approximates the mean of observati ons in the class.
B) When approximating the sample mean for grouped data we cannot assume that the midpoint of each class dosely approximates the mean of observations in the class.
C) Descriptive measures for grouped data are not possible.
D ) None of these choices are correct.