The mean of the distribution, in which the values of X are 1,2,…,n the frequency of each being unity is:

The mean of the distribution, in which the values of X are 1,2,,n the frequency of each being unity is:

  1. A

    n(n+1)2

  2. B

    n2

  3. C

    n+12

  4. D

    none of these

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    Solution:

    We have,

    X¯=1+2+3++nn=n(n+1)2n=n+12

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