Explanation : The joint probability can be computed using the multiplication rule:
P (AB) = P(A B) P(B) where P(A B) is the conditional probability of A given
that B has occurred. If, A refers to the probability that that GE stock will
appreciate and B refers to the probability that the economic growth will be
above average, then the joint probability is: 0.60 * 0.35 = 0.21.