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Question

Following histogram shows certain frequency distribution against class intervals.

The approximated mean of this distribution is:

This question was previously asked in
SSC CGL 2016 (Tier 1) Previous Year Question Paper (11-Sep-2016) (Shift 2)
The correct answer is

37.86

Formula

Mean = ∑fx/∑f

Calculation

Interval

Mid – point (x)

Frequency (f)

Fx

10 – 20

15

8

120

20 – 30

25

20

500

30 – 40

35

16

560

40 – 50

45

24

1080

50 – 60

55

12

660

60 – 70

65

4

260

Total

84

3180

⇒ Mean = 3180/84

∴ The Mean is 37.86 (approx)

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