Question

The mean of 25 observations is 100. If each observation is divided by 5, the new mean will be​

Answer 1

Answer:

Let x1,x2,…,xn be n observations.

Then, x=n1∑xi

let yi=αxi+10

Then, n1i=1∑nyi=α1(n1∑xi)+n1(10n)

⇒y=α1x+10

⇒y=αx+10α

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