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The senior class GPA is 86, with a standard deviation of 6. Chaska has a GPA of 98. What percentage of seniors have a GPA higher than Chaska’s?

 Sep 1, 2021
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98 is tow standard deviations above the mean   ( 86 + 2 *6 = 98) 

Look at the Bell curve below....  

      approx   2.1% are above that

 

  For a more exact answer, look at your z-score tables to find z for 98   (2 s.d. above mean) = .9772

     so scores ABOVE would be   1 - .9772 = .0228      or   2.28% are above 98

 

 

 Sep 1, 2021

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