Homework Statement
Let X be a random variable with distribution function px(x) defined by:
px(0) = a and px(x) = Px(-x) = ((1-a)/2)*p*(1-p)^(x-1), x = 1,2...
where a and p are two constants between 0 and 1, and px(0) is meant to be the probability that X=0
a) What is the mean of X...