The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.7 ppm and standard deviation 1.4 ppm. 13 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 if? 51:\" ~ N(Cj,[::]) c. What is the probability that one randomly selected city's waterway will have less than 9.2 ppm pollutants? E d. For the 13 cities, find the probability that the average amount of [lollutants is less than 9.2 ppm. l:J e. For part d), is the assumption that the distribution is normal necessary? 0 N00 Yes 1'. Find the IQR for the average of 13 cities. Q3 = IQR