When data has been grouped, the mean value cannot be found exactly as the individual values in each class are not known. To find an approximate value for the mean from a grouped frequency table, the ...

Continuous data can be grouped using a frequency tally. The class interval 0 ≤ \(x\) < 10 can have any values greater than or equal to 0 but less than 10 in it. This group includes anything exactly ...

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 ...