Environmental Science

The mean of the distribution in which the value of x are 1, 2 ...... n. The frequency of each being unity is :

1
\(\rm \frac{n}{2}\)
2
\(\rm \frac{n(n + 1)}{2}\)
3
\(\rm \frac{(n + 1)}{2}\)
4
\(\rm \frac{(n - 1)}{2}\)

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