Question

The mean of 25 observations is 36. Out of these observations, if the mean of the first 13 observations is 32 and that of the last 13 observations is 40 , find the 13th observation

Answer 1

let that 13th observation is x

36*25= (32*13)+(40*13)-x

x = 36

Answer 2

13 observations(x)=
36*25=(32*13)+(40*13)-x
x=36