Question

The mean of 15 numbers is 9 if 3 is subtracted from each number what will be the new mean

Answer 1

Refer To Attachment.

$\boxed{\mathbf{Mean=\frac{Sum\:of\:total\:Terms}{Total\:Terms}}}$

Sum of 15 Numbers=135

If -3 From each Number=-45

Mean=135-45/15

=90/15

=6

$\boxed{\mathbf{\huge{Mean=6}}}$

Answer 2

Hey There....!!

Mean of 15 numbers = 9

Mean = Sum of observations ÷ Total Number Of Observations

mean = 9

total observations = 15

Substituting the values in the formula of Mean

9 = Sum of observations ÷ 15

Sum of observations = 135

If three is subtracted from each of the terms, then number to be subtracted from the Total Sum = (3×15) i.e. 45

(135-45) = 90

Hence new sum would be 90

observations would remain the same

Hence new mean = 90÷15 = 6

Hence New Mean is 6

Hope this helpß!!!