A population of values has a normal distribution

celesteh12 2022-10-13

A population of values has a normal distribution with μ=211.7μ=211.7 and σ=23.8σ=23.8. You intend to draw a random sample of size n=232n=232. Please answer the following questions, and show your answers to 1 decimal place.

Find the value separating the bottom 30% values from the top 70% values. 


Find the sample mean separating the bottom 30% sample means from the top 70% sample means.

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The amount of pollutants that are found in waterways near large cities is normally distributed with mean 8.6 ppm and standard deviation 1.4 ppm. 17 randomly selected large cities are studied. Round all answers to 4 decimal places where possible.

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