The mean of the first ten even natural number is-
A. 0 B. 10 C. 11 D. 12 Answer: Option CShow Answer
Solution(By Apex Team)
$\begin{aligned}&\text{ Required mean }\\
&=\left(\frac{2+4+6+\ldots\ldots+20}{10}\right)\\
&=\frac{2(1+2+\ldots\ldots+10)}{10}\\
&=\left(\frac{1}{5}\times\frac{10\times11}{2}\right)\\
&\left[\because1+2+3+\ldots+n=\frac{n(n+1)}{2}\right]\\
&=11\end{aligned}$
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