Question

The arithmetic mean of 1, 2, 3 _ _ _n is​

Answer 1

Hi friend!

Answer:

The arithmetic mean of any series of number is Sum of all numbers ÷ No. of obsv

When numbers are consecutive, and there are n numbers, their sum is given by the formula:

$\frac{n(n + 1)}{2}$

So Arithmetic Mean would be:

$\frac{sum \: of \: all \: obsv}{no. \: of \: obsv} \\ =\frac{n(n + 1)}{2} \times \frac{1}{n} \\ = \frac{n + 1}{2}$

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