Question

if the mean of a set of observations what is the mean of a set of 9 observations X 1 X 2 x 3 x 4 x 6 x 7 x 8 x 9 is 20 find the mean of X 1 + 4 x 2 + 8 x 3 + 12 x 4 x 4 x 6 x 7 x 8 x 9
x 10 + 40 ​

Answer 1

mean =sum of observation by total number of observation

1+4+2+8+3+12+4+4+6+7+8+9+10+40÷

14

118÷14

ans. 8.42