Let someone else drive, bridge commuters told

This is another instance of the use of decimal places to represent parts of wholes which do not exist in the data used to computer the average. Two good exercises are possible from this information. One is to check how the 15,000 a day figure can be obtained by varying the number of people per car. The other is to draw a picture of a bridge and place cars and people on it so that the average number of people per car is 1.5. There are of course many possible solutions which students can compare and discuss.

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