This paper offers class mark estimators for the intervals of a grouped frequency distribution, derived by parabolic interpolation between any given interval and its adjacent intervals. The objective ...

When class widths are not equally sized, they are called unequal class intervals. The area of the bar represents the frequency, so to find the height of the bar, divide frequency by the class width.

A frequency diagram is a type of graph used to represent a continuous set of grouped data. First, identify the largest frequency. The largest frequency is 12. Therefore, the scale on the vertical axis ...