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The arithmetic mean of first 11 natural numbers is

A. 5 B. 5.5 C. 6.0 D. 6.5 Answer: Option C
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Solution(By Apex Team)

$\begin{aligned}&\text{ Required mean }\\ &=\left(\frac{1+2+\ldots\ldots+11}{11}\right)\\ &=\left(\frac{1}{11}\times\frac{11\times12}{2}\right)\\ &=6\\ &\left[\because1+2+\ldots.+n=\frac{n(n+1)}{2}\right]\end{aligned}$

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