19. The 68-95-99.7 Rule. A set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the percentage of scores in each of the following categories. a. greater than 100 c. less than 80 e. less than 60 b. greater than 120 d. less than 140 f. less than 120

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