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1 Comment Already

nohglf Said,
November 12th, 2010 @11:29 am  

I used a TI-83 Plus calculator and pressed 2nd Vars
(Vars is above the tangent TAN key on the calculator)

Next I went to option 2 which is the normalcdf() function

Then I did this

normalcdf(-9999, 580,500,100) = .7881

I believe that choice D is within the 80th percentile.

To find where it is exactly 80% you would do this

invNorm(.8,500,100) = 584.16

The scores are recorded in multiples of 10 so this rounds to 580.

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