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I need help with this question Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 509 and a standard deviation

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I need help with this question

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Scores on the GRE (Graduate Record Examination) are normally distributed with a mean of 509 and a standard deviation of 117. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score below 158 The percentage of people taking the test who score below 158 is %

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