The following data represents the marks of 11 students in group (A) :

The following data represents the marks of 11 students in group (A) :

14, 20, 17, 16, 18, 19, 15, 13, 2, 20, 14, 12

Compute the best central and dispersion measures.

If the central and dispersion measures for the marks of the students in group (B) are as follows:

Where s.d standard deviation

Which group is better in the sense of homogeneity, group (A) or Group (B)? State the reason of your answer.