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If the variable takes values 0,1,2,…, n ...

If the variable takes values `0,1,2,…, n` with frequencies `q^(n),""^(n)C_(1)q^(n-1)p, ""^(n)C_(2)q^(n-2)p^(2), ... ""^(n)C_(n)p^(n), " where " p+q=1`, then the mean is

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