Question 6.385

40. Tobacco-Related Deaths. The World Health Organization states that tobacco is the second leading cause of death in the world. Every year, a mean of 5 million people die of tobacco-related causes. Assume that the distribution is normal with and .

  1. Find the probability that more than 4 million people will die of tobacco-related causes in a particular year.
  2. Find the 25th percentile of the distribution of tobacco-related deaths.
  3. Is there a way you can use symmetry and your answer to part (c) to find the 75th percentile of the distribution of tobacco-related deaths?
  4. In one particular year, 8 million people died from tobacco-related causes. Determine whether this is unusual.