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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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