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. Speed (mph) Cars 30-39 6 40 - 49 17 50-59 47 60-69 18 70-79 12 (++) OA. 61.4 mph OB. 55.8 mph O C. 54.5 mph O D. 58.6 mph

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