Gasoline shortages in the United States have produced long lines of motorists at service stations. The table

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Gasoline shortages in the United States have produced long lines of motorists at service stations. The table below shows a distribution of the times required to obtain gasoline at 23 Center County service stations.
a. What is the average time required?
b. If you were to ask randomly among those people waiting in line, “How long have you been waiting?” what would be the average of their answers?Total Waiting Time (min) 0369 12 15 18 21 Number of Stations Having That Total Waiting Time 04 3 5 8 2 10

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