Find the mean of each of the following frequency distributions :

Class interval: 0−10 10−20 20−30 30−40 40−50

Frequency: 9 12 15 10 14

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Solution

Let the assumed mean be A = 25 and h = 10.

We know that mean,

Now, we have.

Putting the values in the above formula, we have

Hence, the mean is 26.333.

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Similar questions

Class	0-10	10-20	20-30	30-40	40-50
Frequency	$7$	$15$	$13$	$17$	$10$

Class-intervals	0-10	10-20	20-30	30-40	40-50
Frequency	12	11	14	10	13

27

p

Class:	0-10	10-20	20-30	30-40	40-50
Frequency:	$8$	$p$	$12$	$13$	$10$

Class Interval	0-10	10-20	20-30	30-40	40-50	50-60
Frequency	12	20	26	18	10	6

Class interval:	0−10	10−20	20−30	30−40	40−50	50−60	Total
Frequency:	5	f₁	20	15	f₂	5	60

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