Question

Find the mean of first 10 even natural numbers.

Answer 1

The first 10 even natural numbers are 2,4, 6, 8,10,12,14,16,18 and 20. Let ​$\overline{X}$ denote their arithmetic mean. Then,

$\overline{X}$ = $\frac{2+4+6+8+10+12+14+16+18+20}{10}=\frac{110}{10}=11$.