The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.3 ppm and standard deviation 1.3 ppm. 10 randomly selected large cities are studied. Round all answers to 4 decimal places where possible.   What is the probability that one randomly selected city's waterway will have more than 8.8 ppm pollutants?  For the 10 cities, find the probability that the average amount of pollutants is more than 8.8 ppm.  For part d), is the assumption that the distribution is normal necessary? No, Yes Find the IQR for the average of 10 cities. Q1 =  ppm Q3 =  ppm IQR:  ppm

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.