The marks obtained in the previous class test out of 20 were as follows:
19 10 9 8 14 11
11 11 12 11 9 12
19 19 17 10 13 8
18 16 17 5 14 16
4 12 10 7 18 15
What is the number of classes?
6
5
7
4
19 10 9 8 14 11
11 11 12 11 9 12
19 19 17 10 13 8
18 16 17 5 14 16
4 12 10 7 18 15
What is the number of classes?
6
5
7
4