first cost p net revenue p $300,000 0.2 $ 70,000 0.3 400,000 0.5 90,000 0.5 600,000 0.3 100,000 0.2 (a) what is the joint probability distribution for first cost and net revenue? (b) define optimistic, most likely, and pessimistic scenarios by using both optimistic, both most likely, and