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

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Answer variants:

\frac{n - 1}{2}

\frac{n + 1}{2}

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

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

Find the mean and variance of the first \(n\) natural numbers.

Answer:

Mean \(=\)

Variance \(=\)

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23. Five mark example problem VII