Question

In the last quarter of​ 2007, a group of 64 mutual funds had a mean return...

In the last quarter of​ 2007, a group of 64 mutual funds had a mean return of 3.8% with a standard deviation of 6.2%. 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.

a) Returns of

10%

or more
​b) Returns of

3.8%

or less
​c) Returns between

-14.8 and 22.4​%

​d) Returns of

more than

16.2​%

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