The image below shows some of the calculations and the decision tree. Based on these, we can answer the questions
1
Optimistic criteria is to choose the best among the best options. That is D1 with the cost of 2500 only
2.
The pessimistic criteria is to choose the best among the worst options. That is D2 with the cost of 4200 only
3.
The regret criteria chooses the best among the regrets. That is D2 with the regret of 1200
4.
The decision tree is shown below. The circle nodes are D1, D2, D3, and D4 respectively.
5.
The expected monetary value is calculated by multiplying the probabilities with their payoff for each decision. The probabilities are 0.2, 0.35 and 0.45 for S1, S2, and S3. The EMVs are shown. The best EMV is alternative D2 with the least cost of 3855
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