Is lack of sleep causing traffic fatalities? A study found

Is lack of sleep causing traffic fatalities? A study found that the average number of fatal crashes caused by drowsy drivers each year is 1600. Assume that annual number of fatal crashes is normally distributed with a standard deviation of 250.

Please complete using excel functions.

e. What is the probability of more than 1750 fatal crashes a year due to drowsy drivers?


f. What is the probability of no more than 1600 fatal crashes a year due to drowsy drivers?


g. Given that the probability of there being more than 1700 crashes per year is 0.31, use this information (not an Excel function) to find the probability of there being less than 1400 crashes per year due to drowsy drivers.




h. Explain how you determined your answer in part g using the given probability.

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