Question

Average of number is 12 if 2 subtracted from each number then what is the average of new number

Answer 1

Mean =12

X1 +x2+x3.......xn /n= 12

X1+x2+x3.......xn = 12n

Now

(X1 -2)+(x2-2)+(x3-2)........(xn-2) /n

=(X1 +x2 +x3 ........xn)-2n/n

=(X1 +x2 +x3......xn/n )-2n/n

=12 -2

=10