In the last quarter of 2007, a group of 64 mutual funds had a mean return of 3.9% with a standard deviation of 7.7%. 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. a) Returns of -11.5% or less b) Returns of 3.9% or less c) Returns between - 19.2% and 27.0% d) Returns of more than 11.6% ... a) The expected percentage of returns that are - 11.5% or less is %. (Type an integer or a decimal.)

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