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High school graduates: The National Center for Educational Statistics reported that 82% of freshmen entering public high schools in the U.S. in 2009 graduated with their class in 2013. A random sample of 135 freshmen is chosen.
Find the mean
Find the standard deviation
Find the
Find the probability that the sample proportion of students who graduated is between 0.75 and 0.85.
Find the probability that more than 75% of freshmen in the sample graduated.
Would it be unusual if the sample proportion of students who graduated were more than 0.90?
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