Compute the mean and variance of the distribution
For the pmf, compute the mean and variance of the distribution. Determine the constant c so f(x) is satisfied.
a. f(x)=cx, x=1,2,3,4,5,6
b. f(x)=c(x+1)^2, x=0,1,2
c. f(x)=c(x^2+1), x=-1,0,1
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