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The rate of speed of vehicles on I-85 is normally distributed within mean of 52 mph and standard deviation of 3.71. The probability that a

The rate of speed of vehicles on I-85 is normally distributed within mean of 52 mph and standard deviation of 3.71. The probability that a random vehicle along I-85 has a rate of speed between 42 and 71 mph is about? (Round four decimal places if necessary)

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