Question 6.442

20.Drunk-Driving Deaths. in the United States, a mean of 48 people per day are killed in vehicle accidents involving a drunk driver. Assume that the distribution of drunk-driving accident deaths per day is normal, , and .

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  1. Find the probability that, at most, 12 people will be killed in drunk-driving accidents today.
  2. Find the probability that between 50 and 80 people will be killed in drunk-driving accidents today.
  3. Find the 99.5th percentile of the number of drunk-driving accident deaths.
  4. Suppose on one particular day in the United States, 60 people are killed in drunk-driving accidents. Is this unusual? On what do you base your answer?