Question

Find the mean of first 10 even natural number

Answer 1

Mean$=\frac{sumofnumbers}{countofnumbers}=\frac{2+4+.....+20}{10}=\frac{2(1+2+.....+10)}{10}$

$=\frac{1}{5}\times \frac{10\left(11\right)}{2}=11$.