Calculate the mean for the following frequency distribution:

Marks

10 - 20

20 - 30

30 - 40

40 - 50

50 - 60

60 - 70

70 - 80

Frequency

3

7

10

6

8

2

4

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Solution

The given frequency distribution is:

Thus, the mean can be calculated as:

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Similar questions

Class	0-10	10-20	20-30	30-40	40-50	50-60
Frequency	3	6	8	15	10	8

Class	0−10	10−20	20−30	30−40	40−50	50−60	60−70
Frequency	2	4	6	8	6	4	2

Mark	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90
No. of students	8	10	15	25	20	18	9	5

Class	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
Frequency	5	3	4	3	3	4	7	9	7	8

Class	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
Frequency	5	3	4	3	3	4	7	9	7	8

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Marks	10 - 20	20 - 30	30 - 40	40 - 50	50 - 60	60 - 70	70 - 80
Frequency	3	7	10	6	8	2	4