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12. The New York City 10k race finish times are normally distributed with mean of 61...

12. The New York City 10k race finish times are normally distributed with mean of 61 minutes and a standard deviation of 9 minutes.

  1. Determine the percentage of runners who have a time between 50 and 70 minutes.
  2. Determine the percentage of runners who have finishing times of 75 minutes or less.
  3. Obtain the 40th percentile of the finishing times.
  4. Find the 8thdecile (8 * 0.10) of the finishing times.
Math   Statistics-And-Probability   
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