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Mean

Find the mean...

Question

Find the mean of the squares of the first five natural numbers.

A

10

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B

13

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C

50

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D

91

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Solution

The correct option is C
50

Squares of first 7 whole numbers are 1, 4, 9, 16, 25

Mean = $\frac{s u m o f o b s e r v a t i o n s}{N u m b e r o f s t u d e n t s}$ = $\frac{(1 + 4 + 9 + 16 + 25 + 36)}{5}$

mean=11

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