Question

The mean of first odd $n$ natural numbers is

• A. $n$
• B. $2n$
• C. $n+2$
• D. $\frac{n}{2}$

Answer 1

Answer: (A)

$n$

Series of n odd natural numbers will be: $1,3,5,..n$
Sum of the series $=\frac{n}{2}\{2\times 1+(n-1)\times 2\}$ $=n^2$
Mean of the series $=\frac{n^2}{n}$ $=n$