Question 17 0/1 pt 9 3 When asked:"What is the distribution of X or X ? X or X - N(_,_)." This notation is referring to N, a normal distribution, with the mean given in the first space and the standard deviation in the second space. Remember that the standard deviation of the sample means is different from the population standard deviation. The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.3 ppm and standard deviation 1.6 ppm. 40 randomly selected large cities are studied. Round z-scores to 2 decimal places for use in calculations. Round probability answers to 4 where possible. Round quartiles to 1 decimal place. a. What is the distribution of X? X - N( b. What is the distribution of X? X - N( c. What is the probability that one randomly selected city's waterway will have less than 10 ppm pollutants? d. For the 40 cities, find the probability that the average amount of pollutants is less than 10 ppm. e. For part d), is the assumption that the distribution is normal necessary? O NoO Yes f. Find the IQR for the average of 40 cities. Q1 = ppm Q3 = ppm IQR ppm