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## Raul received a score of 77 on a history test for which the class mean was 70 with a standard deviation of 6. He received a score of 79 on a

Question

Raul received a score of 77 on a history test for which the class mean was 70 with a standard deviation of 6. He received a score of 79 on a biology test for which the class mean was 70 with standard deviation 4. On which test did he do better relative to the rest of the class?

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Math
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2021-09-09T09:31:25+00:00
2021-09-09T09:31:25+00:00 1 Answer
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## Answers ( )

Answer:He did better on biology test.Step-by-step explanation:For comparing the scores we need to find z-scores for both subjects,

We know that,

z-score or standard score for x is,

Where, is mean,

is standard deviation,

In history test,Thus, the

z-scorewould be,In biology test,,

Thus, the

z-scorewould be,∵

Hence,

he did better on biology test.