In the last quarter of 2007, a group of 64 mutual funds had amean retu...

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

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In the last quarter ofâ€‹ 2007, a group of 64 mutual funds had amean return of 5.9% with a standard deviation of 7.1â€‹%.
If a normal model can be used to modelâ€‹ them, what percent ofthe funds would you expect to be in eachâ€‹ region? Use theâ€‹68-95-99.7 rule to approximate the probabilities rather than usingtechnology to find the values more precisely. Be sure to draw apicture first.
â€‹a) Returns of negative âˆ’1.2â€‹% or less â€‹b) Returns of 5.9â€‹% or more
â€‹c) Returns between negative âˆ’8.3â€‹% and 20.1â€‹% â€‹d) Returns of more than 27.227.2â€‹%

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a 12 59 71 that is 1 standard deviation less than themean Using the 6895997 rule of the normal distribution we knowthat 68 of the observations lies within 1 standard deviation ofthe See Answer

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â€‹a) Returns of negative âˆ’1.2â€‹% or less	â€‹b) Returns of 5.9â€‹% or more
â€‹c) Returns between negative âˆ’8.3â€‹% and 20.1â€‹%	â€‹d) Returns of more than 27.227.2â€‹%