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Question

Find the mean, using direct method:
Marks 10-20 20-30 30-40 40-50 50-60 60-70 70-80
Number of students 6 8 13 7 3 2 1

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Solution

Class

Frequency fi

Mid Values xi

(fi×xi)

10-20

6

15

90

20-30

8

25

200

30-40

13

35

455

40-50

7

45

315

50-60

3

55

165

60-70

2

65

130

70-80

1

75

75

fi=40

(fi×xi)=1430

Mean, x¯=(fi×xi)fi= 143040=35.75x¯=35.75


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