A highway study of 8,000 vehicles that passed by a checkpoint found that their speeds were...
A highway study of 8,000 vehicles that passed by a checkpoint found that their speeds were normally distributed, with a mean of 100 Km/h and a standard deviation of 10 Km/h. Using the Empirical rule determine the percent of the vehicles had a speed between 70 and 100 km/h?
Homework Answers
We have speeds are normally distributed with mean 
= 100 km/h and standard deviation 
= 10km/h
Using empirical rule
Percentage of vehicles had a speed between 
= 70 to
= 100 is 49.85%
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