1. The probability mass function of a discrete random variable X
is defined as p(x) = ax for x = 1, 2, 4, 8 (p(x) =0 for all other
values) then the value of a is?
2. Let X be a discrete random variable with Var(X) =6.0 and
E(X2) = 17.00. Then: E(X) = ?
3. If X is a binomial random variable with parameters n and p,
i.e. X ~ b(x; n, p), then the expected value of X...