Hi, in the grouped frequency table below please show me how to calculate the Class heights (last column) please.

Show the formula and the workings

Class Number of people = f Mid Point Frequency Midpoint Cumulative FrequencyF Class Height

0 under 5 1375.3 2.5 3438.25 1375.3 511.24

5 under 15 2750. 5 7.5 20628.75 4125.8 550.1

15 under 30 4514.7 22.5 101580.75 8640.5 300.98

30 under 50 6137.7 40 245508 14778.2 306.885

50 under 65 3821.7 57.5 219747.75 18599.9 254.78

65 under 80 2045.7 72.5 148313.25 20645.6 102.285

80 under 100 783.2 90 70488 21428.8 39.16

100 under 110 3.1 105 325.5 21431.9 0.31