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On a nationwide test taken by high school students, the mean score was 46 and the standard deviation was 13. The scores were normally distributed.

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On a nationwide test taken by high school students, the mean score was 46 and the standard deviation was 13. The scores were normally distributed. Complete the following statements. (a) Approximately 68% of the students scored between and . (b) Approximately ? v of the students scored between 20 and 72. X

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