Question

Find the average of first 10 multiples of 7. A.35.5 B.37.5 C.38.5 D.40.5

Answer 1

AVERAGE= SUM OF OBSERVATIONS/ NO. OF OBSERVATIONS
= 7+14+21+28+35+42+49+56+63+70 / 10
=385/10
=38.5

C is the correct answer


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Answer 2

The Average of the number is $=\frac{Sum of the numbers}{Total numbers count}$

Given: The first 10 multiples of 7.

7, 14, 21, 28, ......70

The above series in AP.

Therefore, Sum of the series is,

$S_n=\frac{n}{2}(a+l)$

$n=10\\a=7\\l=70$

$S_{10}=\frac{10}{2}(7+70)$

$S_{10}=5(77)$

$S_{10}=385$

Average $=\frac{385}{10}$

$=38.5$

Option  C is correct  answer.

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