Question

The mean value of the following observations is 9:
x, x+3,x+6,x+9,x+12
???​

Answer 1

The observations are: x,x+3,x+6,x+9,x+12

$\bold{Mean = \frac{Sum}{number of observations} }$

$\bold{Mean = \frac{x+x+3+x+6+x+9+x+12}{5} }$

$\bold{Mean = \frac{5x + 30}{5} }$

Mean = x+6

Answer 2

Answer:

I think answer will 12

according to me