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The speeds of a random sample of 100 cars are recorded as they pass a highway checkpoint. The results are summarized in the frequency distribution

The speeds of a random sample of 100 cars are recorded as they pass a highway checkpoint. The results are summarized in the frequency distribution below. Approximate the sample mean, sample variance and sample standard deviation.Be sure to show all work.

Speed (mph)Cars

30-393

40-4918

50-5952

60-6916

70-7911

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