SOLUTION: If the scores on your first statistics test were normally distributed with a mean of 75 and a standard deviation of 12, what is the least score (to the nearest integer) you could

Question 519848: If the scores on your first statistics test were normally distributed with a mean of 75 and a standard deviation of 12,
what is the least score (to the nearest integer) you could have to be in the top 10% of your class?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If the scores on your first statistics test were normally distributed with a mean of 75 and a standard deviation of 12,
what is the least score (to the nearest integer) you could have to be in the top 10% of your class?
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Find the z-value with a left-tail of 0.90:
inv(0.9) = 1.2816
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Find the corresponding x-value:
x = 1.2816*12+75 = 88.28
===========================
Cheers,
Stan H.
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