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Graders the mean score

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Stacy, who is in 8th grade, and Brittany, who is in 12th grade, each take a math competition test. Stacy scored 36 on the test and Brittany scored 67. For all 8th graders the mean score was 30 with a standard deviation of 5. For all 12th graders the mean score was 61 with a standard deviation of 12. Who did better relative to what grade they are in? Show all supporting work.

Reference no: EM131092252

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