Question

Find the mean of first seven multiples of 9

Answer 1

mean=sum of all observation/no. of observation

mean=9+18+27+36+45+54+63/7
. =252/7
. =36

mean=36

Answer 2

First 7 multiples of 9 are:

9,18,27,36,45,54,63.

We know that Mean = Sum of observations/Number of observations

                                  = 9 + 18 + 27 + 36 + 45 + 54 + 63/7

                                  = 252/7

                                  = 36.


Hope this helps!