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Sum of first n natural numbers

Arithmetic me...

Question

Arithmetic mean of $5$ numbers is $27$ . If one number is missed by mistake then Arithmetic mean is $25$ . Find the missing number.

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Solution

$A . M . = \frac{s u m o f n u m b e r s}{n}$
Sum of the five numbers $= 27 \times 5 = 135$
Sum of remaining four numbers $= 25 \times 4 = 100$
$\Rightarrow$ missing number = 135 - 100 = 35

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Sum of first n natural numbers

Standard X Mathematics

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