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The mean for IQ is 100, and the standard deviation is 15. 1) 20% of observations...

The mean for IQ is 100, and the standard deviation is 15.
1) 20% of observations fall beyond a certain score, what is the z-score?
2) Take the z-score from the previous question and identify the IQ score at the 80th percentile.
Math   Statistics-And-Probability   
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