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February 28th, 2016, 07:33 AM  #1 
Newbie Joined: Feb 2016 From: Portland, Maine Posts: 1 Thanks: 0  Statistics question
During the school year, the students in the local high school class read an average of 56 books with a standard deviation of 8 books. What percent of the population read less than 40 or more than 72 books?

February 28th, 2016, 08:04 AM  #2 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics 
This question is quite similar to another one that was just posted. Read my answer to that thread, and note that 40 is two standard deviations below the mean while 72 is two standard deviations above. What can you conclude?


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