Question 9

Question 9 The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.4 ppm and standard deviation 1.7 ppm. 8 randomly selected large cities are studied. Round all answers to 4 decimat places where possible. a. What is the distribution of X? X N b. What is the distribution of i? N( c. What is the probability that one randomly selected city's waterway will have more than 8.6 ppm pollutants? d. For the 8 cities, find the probability that the average amount of pollutants is more than 8.6 ppm. For part d), is the assumption that the distribution is normal necessary? C) YesO No e.