To compare the two classes, the Coefficient of Variation (COV) can be used. The formula for COV is this: C = s / x where s is the standard deviation and x is the mean For the first class: C1 = 10.2 / 75.5 C1 = 0.1351 (13.51%)
For the second class: C2 = 22.5 / 75.5 C2 = 0.2980 (29.80%)
The COV is a test of homogeneity. Looking at the values, the first class has more students having a grade closer to the average than the second class.