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Question

Find the mean of all the positive factors of $72$
$17.25$
$18.25$
None of these
$16.25$

A

16.25

B

17.25

C

18.25

D

None of these

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Solution

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Factors of $72$ are : $1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72$
$M e a n = \frac{S u m}{C o u n t}$

$M e a n = \frac{1 + 2 + 3 + 4 + 6 + 8 + 9 + 12 + 18 + 24 + 36 + 72}{12}$

$M e a n = \frac{195}{12}$

$M e a n = 16.25$

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