The amount of pollutants that are found in waterways of cities in a county is normally distributed with mean 8.5 ppm and standard deviation 1.4 ppm. Five randomly selected cities in the county are studied. (a) My = ppm (Round answer to one decimal place.) (b) = ppm (Round answer to one decimal place.) (c) The probability that one randomly selected city's waterway in the county has at most 5.7 ppm pollutants is % Use the Empirical Rule. (d) The probability that one randomly selected city's waterway in the county has at least 9 ppm pollutants is Do not use the Empirical Rule. Give answer to the nearest percent (whole number)