A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 61 mph and a standard deviation of 7 mph. a. How many of the vehicles had a speed of more than 63 mph. b. How many of the vehicles had a speed of less than 40 mph.

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A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 61 mph and a standard deviation of 7 mph.

 

a. How many of the vehicles had a speed of more than 63 mph.

b. How many of the vehicles had a speed of less than 40 mph.

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