Question 3.492

13. Refer to the information in Exercise 12. Assume the distribution is bell-shaped. (Hint: Use your knowledge about the Empirical Rule to give a range for the proportions in parts (b) and (d)).

  1. Find the 50th percentile.
  2. Estimate the proportion of Americans who drink between 20 and 100 gallons per year.
  3. Discuss whether we could find the estimate in (b) without assuming that the distribution is bell-shaped.
  4. Estimate the proportion of Americans who drink more than 100 gallons per year.