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I have no idea how to go about this! I've been checking all through my notes and the more I look the more confused I get. Can someone please help me? I reall need to compelte this asap :(

 May 13, 2019
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a.  On the curve....put 71  in the middle   and the three deviations (the vertical segments to the base of the curve ) to the right will be  77, 83  and 89

And the 3 deviations to the left - starting from the mean and  working to the left-  will be  65, 59  and 53

 

b.   z score  =  [ Angelic'a grade - Mean ] / Standard Deviation =  [ 76 - 71 ] / 6  =  5/6 = . 83

 

c. Looking at a z score table.....   .83  equates to ≈  .7967   =  79.67%

This means that she scored highr than about 80%  of the students

 

d.  About   20% scored higher....so.....20 (185) =   37 students

 

 

cool cool cool

 May 14, 2019
edited by CPhill  May 14, 2019

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