Question

The mean of 10 number is 25.if 1 number will excluded their mean is 20. Find the excluded observation.​

Answer 1

Answer:

The mean of 10 observation is 25 . If one observation namely 25 , is deleted, the new mean is

Answer 2

Given,

The mean of 10 numbers is 25

If one number exclude then their mean is 20

We find exculede numbers,

Solñ

So sum of 10 numbers is = 10×25 = 250

If one number exclude then, , = {10-1]= 9 and its mean is given = 20

So ,

sum of 9 numbers is = 20×9 = 180

Then excluded number is = 250- 180 = 70

So, The excluded observation is = 70 Ans