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mean and variance of the discrete uniform distribution


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 find the mean and variance of the discrete uniform distribution
f(x) = 1 / k ,  x = 1,2, . . . ,k
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use the defintion of E(X) and since the variable is discrete,
use summation , manipulate the summation
into the sum of the first k natural numbers and the sum of their squares
 answer and  some steps are given below
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