Five mark example problem VII — task. Mathematics State Board, Class 10.

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Answer variants:

$\frac{n^{2} - 1}{12}$

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

$\frac{n - 1}{2}$

$\frac{n^{2} + 1}{12}$

Find the mean and variance of the first

$n$ natural numbers.

Answer:

Mean

$=$

Variance

$=$

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