In the last quarter of 2007, a group of 64 mutual funds had a mean return of 2.1% with a standard deviation of 4.5% 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
negative −2.4% or less |
b) Returns of
2.1% or less |
c) Returns between
negative -11.4% and15.6% |
d) Returns of
more than11.1% |
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