11 . How do I solve it

Question 11 Using the joint probability table below, determine the marginal distribution of X. -1 0 3 0 0.15 0.05 5 0.05 0.1 0.15 7 0.05 0.15 0.3 a) O X -1 0 P(X) 0.05 0.15 0.3 b) O X -1 0 1 P(X) 0 0.15 0.05 c O X - 0 P(X) 0.1 0.4 0.5 d) O X -1 0 P(X) 0.2 0.3 0.5 e) O None of the above. e)