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Cars were timed by police radar as they passed in both directions below a bridge. Their...

Cars were timed by police radar as they passed in both directions below a bridge. Their velocities in kilometers per hours (number of cars in parentheses) were as follows:

East: 80(43), 90(50), 100(5)

West:80(46), 90(45), 100(5)

Calculate the mean speed and root mean squared speed using the distribution method.

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