Concept explainers
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
Find the standard deviation
Find the probability that less than of freshmen in the sample graduated.
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?
Want to see the full answer?
Check out a sample textbook solutionChapter 7 Solutions
Elementary Statistics ( 3rd International Edition ) Isbn:9781260092561
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillCalculus For The Life SciencesCalculusISBN:9780321964038Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.Publisher:Pearson Addison Wesley,Big Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt