The mean of the distribution, in which the values of \( X \) are \( 1,2, \ldots, n \), the frequ...

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The mean of the distribution, in which the values of \( X \) are \( 1,2, \ldots, n \), the frequency of each being unity is:
(A) \( \frac{n(n+1)}{2} \)
(B) \( \frac{n+1}{2} \)
(C) \( \frac{n}{2} \)
(D) none of these
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