Question

If the mean of 10 observations is 12, what is their sum?​

Answer 1

the sum of the mean is 120

Answer 2

Answer:

let the 10 observations are

x, x+1, x+3, x+4, x+5, x+6, x+7, x+8, x+9

The number of observations=10

Given that the mean of 10 observations=12

we know that,

mean = sum of all observations / no.of observations

then,

mean=x+x+1+x+3+x+4+x+5+x+6+x+7+x+8+x+9/10

mean =10x+45/10=12

=10x+45=12×10

=10x+45=120

therefore the sum of 10 observations= 120