Question

the marks obtained by 100 Students in an examination are given below ​

Answer 1

Given : marks obtained by 110 Students in an examination

To Find  : Mean Marks

Solution:

CLASS CLASS MARK (M) f d=(M-47.5)/5 f.d

30-35 32.5                 14 -3 -42

35-40 37.5                  16    -2 -32

40-45 42.5                 28 -1 -28

45-50 47.5                  23 0 0

50-55 52.5                18 1 18

55-60 57.5                        8       2 16

60-65 62.5                 3 3 9

                               110  -59

Mean = 47.5 + 5 * (-59)/110

= 47.5 - 2.682

= 44.818

44.818  is the mean marks.

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