Question

Find mean of the following data.
X, X +3, x +6, x +9, x +12 , x + 15 and x + 18​

Answer 1

Answer:

mean= x+x+3+x+6+x+9+x+12+x+15+x+18/7

= 7x+63/7

=7(x+9)/7

=x+9

therefore mean=x+9