What is the term for the middle value of a class in a frequency distribution?

Class mark

The correct answer is option 3: Class mark

The class mark (or class mid-point) is the middle value of a class. It is calculated as the average of the upper and lower class limits.

Here's why the other options are not correct:

a) Class interval:This refers to the width or range of values within a class in the frequency distribution.
b) Class frequency: This represents the number of observations that fall within a specific class.
d) Class limit: This refers to the upper and lower boundaries of a class in the distribution.