Final answer:
By calculating the expected value of each possible outcome of the lawsuit and adding them together, the man's expected gain from the lawsuit is estimated to be $20,000.
Step-by-step explanation:
To estimate the man's expected gain or loss for proceeding with the lawsuit, we need to multiply each outcome by its respective probability and sum the results.
- Multiply the gain or loss by the probability of that outcome:
- Gain of $40,000 with a 70% probability: 0.7 x $40,000 = $28,000
- Break even with a 10% probability: 0.1 x $0 = $0
- Loss of $40,000 with a 20% probability: 0.2 x -$40,000 = -$8,000 - Add the results to find the expected value:
$28,000 + $0 - $8,000 = $20,000
Therefore, the man's expected gain if he proceeds with the lawsuit would be $20,000.