Brie L.
asked • 05/31/21Please help with statistics!
A population of values has a normal distribution with μ=82.6 and σ=56.2. You intend to draw a random sample of size n=223.
Find P9, which is the score separating the bottom 9% scores from the top 91% scores.
Find P9, which is the mean separating the bottom 9% means from the top 91% means.
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1 Expert Answer
Hello, thank you for posting your question!
When it says P9 that refers to the 9th percentile, so what you want to do is use either a normal distribution table or calculator in order to find what Z score goes with that percentile level. In this case that would be Z = -1.34.
From there then you can use the formula
x = mean + z * standard deviation in order to solve for the score value.
Hopefully that helps get you moving in the right direction! :)
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Brie L.
Never mind, figured it out05/31/21