Find the average of the first 50 natural numbers.

First 50 natural numbers

(1, 2, 3, ........50)

sum of first 50 natural numbers

$Average=\frac{1+2+3+\mathrm{....}+50}{50}$

$=\frac{1275}{50}$

$\frac{n+1}{2}=\frac{51}{2}=25.5$