Assume that the distribution of speeds at interstate highway location is bell-shaped with a mean of 70 mph and a standard deviation of 8 mph. Use the appropriate Excel functions to answer the following questions.
Calculate a z-score for someone who is traveling 95 mph. Is it likely to see someone going this fast? (Use an appropriate function to justify your response and provide the exact probability).
Determine the speed in which 90% of the population drive less than.