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The speeds of vehicles (in mph) passing through a section of Highway 75 are recorded for a random sample of 150 vehicles and are given below. Test the hypothesis that the speeds are normally distributed with a mean of 70 and a standard deviation of 4. Use a = 0.01.

Range	40-55	56-65	66-75	76-85	> 85
Number	12	14	78	40	6

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