Find the average of first 20 multiples of 7. Options: A . &nbsp73.3 B . &nbsp73.5 C . &nbsp73.8 D . &nbsp74

Find the average of fi

Question

Find the average of first 20 multiples of 7.

Options:

A . 73.3

B . 73.5

C . 73.8

D . 74

Answer: Option B

Sol. Required average = `(7(1 + 2 + 3 + ...........+ 20))/(20)`

= `((7 xx 20 xx 21)/(20 xx 2)) = (147/2)` = 73.5.

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