Calculate the mean for the following frequency distribution:

Marks

15 – 19

20 – 24

25 – 29

30 – 34

35 – 39

40 – 44

Frequency

6

5

9

12

6

2

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Solution

The frequency distribution table is:

Thus, the mean can be calculated as:

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Similar questions

Marks	$15 - 19$	$20 - 24$	$25 - 29$	$30 - 34$	$35 - 39$	$40 - 44$
Frequency	$6$	$5$	$9$	$12$	$6$	$2$

Class	5-10	10-15	15-20	20-25	20-30	30-35	35-40	40-45
Frequency	5	6	15	10	5	4	2	2

Age of the donor (Yrs.)	20 - 24	25 - 29	30 - 34	35 - 39	40 - 44	45 - 49
No. of blood doners	38	46	35	24	15	12

Age (in years)	25-29	30-34	35-39	40-44	45-49	50-54	55-59
No. of person	4	14	22	16	6	5	3

X	10−19	20−29	30−39	40−49	50−59	60−69	70−79	80−89
No. Persons	32	42	40	56	20	6	2	2

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Marks	15 – 19	20 – 24	25 – 29	30 – 34	35 – 39	40 – 44
Frequency	6	5	9	12	6	2