6.1 Given a random process X(t) = A sin t, where A is a discrete RV with point masses P{A = 1} = 0.4, P{A = 2} = 0.3, P{A=3} = 0.3 Find (a) the marginal CDF Fx (t) (x) for all t and (b) the joint CDF FX(n/4),X(0)(x1, x2)