Find the mean and variance for the following discrete distributions.

A) f(x) = 1/5, x=5,10,15,20,25

B) f(x) = 1, x=5

C) F(x) = 4-x/6 x=1,2,3

A) f(x) = 1/5, x=5,10,15,20,25

B) f(x) = 1, x=5

C) F(x) = 4-x/6 x=1,2,3

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