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Find the average of natural numbers from 1 to 20 :

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2.5

10.5

12.6

15.5

answer is B.

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Detailed Solution

$A v e r a g e = S u m o f v a l u e s \div N u m b e r o f v a l u e s$

$\begin{array}{l} A v e r a g e = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20) \div 20 \\ A v e r a g e = \frac{210}{20} = 10.5 \end{array}$

Average of first ‘n’ natural numbers = $\frac{(n + 1)}{2}$

$= \frac{20 + 1}{2} = 10.5$

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