Dorothy Stanyard has three major routes to take to work. She can take Tennessee Street the entire way, she can take several back streets to work, or she can use the expressway. The traffic patterns are very complex, however. Under good conditions, Tennessee Street is the fastest route. When Tennessee is congested, one of the other routes is usually preferable. Over the past two months, Dorothy has tried each route several times under different traffic conditions. This information is summarized in minutes of travel time to work in the following table:

In the past 60 days, Dorothy encountered severe traffic congestion 10 days and mild traffic congestion 20 days. Assume that the last 60 days are typical of traffic conditions.
(a) Develop a decision table for this decision.
(b) What route should Dorothy take if she wants to minimize average drive time?(c) Dorothy is about to buy a radio for her car that would tell her the exact traffic conditions before she started to work each morning. How much time in minutes on the average would Dorothy save by buying theradio?

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SEVERE NO TRAFFICMILD TRAFFICTRAFFIC CONGESTION CONGESTION CONGESTION (minutes) (minutes)(minutes) Tennessee Street 15 30 45 Back roads 20 25 35 Expressway 30 30 30