5. Consider a random variable X that is equal 1, 3, 5 or 7 . Suppose X has probability mass function given by : p(1) = 14 , p(3) = 1/s, p(5) =Ps, p(7)= 1/'s . Find: a) the value of Ps, E[X], Var[X] b) cumulative distribution function and graphically present it. c) P(2 3) d) Given Y = X', find E[Y]