Find the mean of each of the following frequency distribution:

Class interval:	10-30	30-50	50-70	70-90	90-110	110-130
Frequency:	5	8	12	20	3	2.

To do:

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

Solution:

Let the assumed mean be $A=60$

 We know that,

Mean $=A+\frac{\sum{f_id_i}}{\sum{f_i}}$    

Therefore,  

Mean $=60+\frac{280}{50}$

$=60+5.6$

$=65.6$

The mean of the given frequency distribution is $65.6$.

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Updated on: 10-Oct-2022

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