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Sofia earned a score of 520 on Exam A that had a mean of 600 and a standard deviation of 40. She is about to take Exam B that has a mean of 400 and a standard deviation of 40. How well must Sofia score on Exam B in order to do equivalently well as she did on Exam A? Assume that scores on each exam are normally distributed.

 Jun 18, 2020
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520 is 2 standard deviations below the mean     (600-520)/40=2

 

2 standard deviations below the mean for second tes would be   400- 2(40)=320

 Jun 18, 2020

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