The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9 ppm and standard deviation 1.3 ppm. 38 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N b. What is the distribution of ? - N c. What is the probability that one randomly selected city's waterway will have more than 9 ppm pollutants? d. For the 38 cities, find the probability that the average amount of pollutants is more than 9 ppm. e. For part d), is the assumption that the distribution is normal necessary? Yes No f. Find the IQR for the average of 38 cities. Q1 Q3 IQR: ppm ppm ppm