Question

the mean of 5 numbers is 27 if one number is included the mean becomes 25 find the included number

Answer 1

Hii

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Mean =27

No.of observations=5

Therefore, sum of all numbers =27x5

=135

Let the new number be x.

New number of observations = 6

So,135+x/6= New Mean.

135+x/6=25

135+x=25x6

135+x=150

therefore x=150-135

x=15.

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Hope it will help u.................

Answer 2

sum of obs.=27 x 5

=135

later=25 x 6

=150

added no.=150-135=15