Bobby and Cindy are in different math classes. Bobby got a 75 on his test and Cindy got a 70 (surprisingly low for children of an architect). Bobby’s class had a mean of 80 and a standard deviation of 5. Cindy’s class had a mean of 75 and a standard deviation of 10. Who did better on their test, Bobby or Cindy?(adsbygoogle = window.adsbygoogle || []).push({});

I calculated the z score of both and found Bobby's z score higher than Cindy's. Does it means that he has done better than Cindy's??

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# Z score

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