In a recent year, 11th grade Ohio public school students taking an English test produced test scores that were normally distributed with a mean of 83 and a standard deviation of 5.9. Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 20% of the scores?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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In a recent year, 11th grade Ohio public school students taking an English test produced test scores that were normally distributed with a mean of 83 and a standard deviation of 5.9. Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 20% of the scores?  

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