Question

the mean of 10 number is 27 if one number is excluded then mean gets reduced by 2 the excluded number is ?​

Answer 1

Mean =sum of 10 no./total no

27=sum of 10 no./10

sum of 10 no. =270 (eq...1)

Now,

if one no. is excluded

Mean =Sum of 9 no./ total no.

25=sum of 9 no./ 9

25×9=sum of 9 no.

225= sum of 9 no.

The excluded no=Sum of 10 no.- Sum of 9 no.

=270-225

=45

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