The average math sat score is 517 with a standard deviation, Ask an Expert

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The average math SAT score is 517 with a standard deviation 119. A particular high school claims that its student have unusually high math SAT scores. A random sample of 40 students from this school was selected, and the mean math SAT score was 539.

Is the high school justified in its claim? Because the z-score is? (Round to two decimal places.)

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