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In the last quarter of​ 2007, a group of 64 mutual funds had a mean return of 2.3​% with a standard deviation of 6.7%. If a normal model can be used to model​ them, what percent of the funds would you expect to be in each​ region? Use the​ 68-95-99.7 rule to approximate the probabilities rather than using technology to find the values more precisely. Be sure to draw a picture first. The expected percentage of returns that are −4.4​% or lessless is _____

 
 Nov 4, 2016

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