9 is found summing standard frequency 7 and 2 (7+2=9). The first frequency is 7, which is the same as the standard frequency 7 on the left. On the above image, you see there is a Cumulative Frequency column. Cumulative Frequency: You get the cumulative frequency from standard frequency.For example, for bin 70-79 we have found 2 scores. Frequency:Frequency is how many values are counted for a bin.The size of the last bin (<40) is 40 as from 0 to 39 there are 40 values. The size of the second bin (70-79), third bin (60-69), fourth bin (50-59), and fifth bin (40-49) is 10 as there are 10 numbers in every bin. Bin: In the above image, there are 6 bins.
