The amount of pollutants that are found in waterways near large cities is normally distributed with mean 8.6 ppm and standard deviation 1.3 ppm. 39 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N 8.6 1.3 Enter an integer or decimal number, accurate to at least 4 decimal places [more..] b. What is the distribution of ? - N( c. What is the probability that one randomly selected city's waterway will have less than 7.9 ppm pollutants? d. For the 39 cities, find the probability that the average amount of pollutants is less than 7.9 ppm. e. For part d), is the assumption that the distribution is normal necessary? Yes No

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F1
The amount of pollutants that are found in waterways near large cities is normally distributed with mean
8.6 ppm and standard deviation 1.3 ppm. 39 randomly selected large cities are studied. Round all answers
to 4 decimal places where possible.
a. What is the distribution of X? X-N 8.6 1.3
b. What is the distribution of ? - N Enter an integer or decimal number, accurate to at least 4 decimal places (more..]
c. What is the probability that one randomly selected city's waterway will have less than 7.9 ppm
pollutants?
d. For the 39 cities, find the probability that the average amount of pollutants is less than 7.9 ppm.
e. For part d), is the assumption that the distribution is normal necessary? Yes No
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Transcribed Image Text:esc F1 The amount of pollutants that are found in waterways near large cities is normally distributed with mean 8.6 ppm and standard deviation 1.3 ppm. 39 randomly selected large cities are studied. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N 8.6 1.3 b. What is the distribution of ? - N Enter an integer or decimal number, accurate to at least 4 decimal places (more..] c. What is the probability that one randomly selected city's waterway will have less than 7.9 ppm pollutants? d. For the 39 cities, find the probability that the average amount of pollutants is less than 7.9 ppm. e. For part d), is the assumption that the distribution is normal necessary? Yes No Question Help:Written Example > Next Question MacBook Air F6 F2 G # 20 F3 $ F4 % F5 G & 7 F7 *00 DII F8 ( DD F9 F10
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