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The amount of pollutants that are found in waterways near large cities is normally distributed with...

The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.3 ppm and standard deviation 1.3 ppm. 40 randomly selected large cities are studied. Round all answers to 4 decimal places where possible.

  1. What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
  2. What is the probability that one randomly selected city's waterway will have less than 8.6 ppm pollutants?
  3. For the 40 cities, find the probability that the average amount of pollutants is less than 8.6 ppm.
  4. For part d), is the assumption that the distribution is normal necessary? NoYes
  5. Find the IQR for the average of 40 cities.
    Q1 =  ppm
    Q3 =  ppm
    IQR:  ppm

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