Question 51

What is the average of first 15 odd numbers among the natural numbers?

Solution

the first 15 odd numbers are 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29

$$\frac{\left(sum\ of\ all\ the\ numbers\right)}{15}=\frac{\left(1+3+5+7+9+11+13+15+17+19+21+23+25+27+29\right)}{15}$$

$$\frac{225}{15}$$=15

hence answer is option B

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