Find the mean of each of the following frequency distributions:

Class interval:	0-6	6-12	12-18	18-24	24-30
Frequency:	6	8	10	9	7.

To do:

We have to find the mean of the given frequency distribution.

Solution:

Let the assumed mean be $A=15$

We know that,
Mean $=A+\frac{\sum{f_id_i}}{\sum{f_i}}$    

Therefore,  

Mean $=15+\frac{18}{40}$

$=15+\frac{9}{20}$

$=15+0.45$

$=15.45$

The mean of the given frequency distribution is $15.45$.

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Updated on: 10-Oct-2022

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