In the above video on what basis we had taken " A " = 10

In these type of questions, we have to find the deviations *d _{i}* by using

*d*=

_{i}*x*– A,

_{i}*i*= 1, 2, 3, ...,

*n*

and then the sum of these deviation i.e. .

We try to make this sum as small as we please for simple calculations, that's why we assume

the assumed mean in such a way so that few values of *d _{i}* are positive and the others are

negative.

The assumption of assumed mean depends on your choice. You can choose this value 12 or 15

or any other value as per your choice. Its not necessary to take assumed mean = 10 as taken in

the video. Answer will be same in all cases.

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