Frequency

Percent

19

1

0.4

23

1

0.4

25

1

0.4

28

4

1.5

29

9

3.5

30

11

4.2

31

12

4.6

32

10

3.8

33

9

3.5

34

13

5.0

35

33

12.7

36

25

9.6

37

39

15.0

38

34

13.1

39

58

22.3

Total

260

100.0

Mean = 35.6                       Minimum value = 19                       Standard deviation = 3.4

Median = 37.0                   Maximum value 39                           Total mark = 13