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OpenStudy (anonymous):
If Sarah is in the 75th percentile for height at age 15, how tall is she? the mean is 63.80 and the standard deviation is 2.66 I want to check my answer.
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OpenStudy (alexwee123):
ok do you know what the z score of 75% is?
OpenStudy (anonymous):
I thought I did. I've completely confused myself.
OpenStudy (anonymous):
find the z score by doing inv norm(.75) on your calculator then multiply that number by 2.66( the standard deviation). then add that number to 63.80. Sorry i cant give you a numerical answer, i dont have a graphing calculator on me right now
OpenStudy (anonymous):
The result is 65.795
OpenStudy (anonymous):
that looks right
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OpenStudy (anonymous):
Thanks :D
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