Question

The amount of pollutants that are found in waterways near large cities is normally distributed with mean 9.2 ppm and standard deviation 1.3 ppm. 13 randomly selected large cities are studied. Round all answers to 4 decimal places where possible.

- What is the distribution of XX? XX ~ N(,)
- What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
- What is the probability that one randomly selected city's waterway will have less than 9.9 ppm pollutants?
- For the 13 cities, find the probability that the average amount of pollutants is less than 9.9 ppm.
- For part d), is the assumption that the distribution is normal necessary? YesNo
- Find the IQR for the average of 13 cities.

Q1 = ppm

Q3 = ppm

IQR: ppm

Answer #1

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. 40 randomly selected large cities are studied.
Round all answers to 4 decimal places where possible.
What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What is the probability that one randomly selected city's
waterway will have less than 8.6 ppm pollutants?
For the 40 cities, find the probability that the average amount
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What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
What is the probability that one randomly selected city's
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