12.5, 17.5, 22.5, 27.5, 32.5, 37.5, 42.5, 47.5

From the data given, the number of class limits formed will be[[1]].

Class mark

Lower class limit

Upper class limit

Class limit

12.5

10-15

17.5

15

20

15-20

22.5

20

25

20-25

27.5

25

30

25-30

32.5

30

35

30-35

37.5

35

40

35-40

42.5

40

45

40-45

47.5

45

50

45-50