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E RANDOM VARIABLES AND DISTRIBUTIONS Word problem involving calculations from a normal distribution Ab On a nationwide test taken by high school students, the mean

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E RANDOM VARIABLES AND DISTRIBUTIONS Word problem involving calculations from a normal distribution Ab On a nationwide test taken by high school students, the mean score was 47 and the standard deviation was 12. The scores were normally distributed. Complete the following statements. (a) Approximately 68% of the students scored between and . (b) Approximately ? |of the students scored between 23 and 71. X 3

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