Scores on a standardized test are normally distributed with mean ฮผ = 69 and standard deviation ฯ = 15. Using the 68-95-99.7 rule, what percentage of scores fall between 54 and 84? Answer: 68
Scores on a standardized test are normally distributed with mean ฮผ = 165 and standard deviation ฯ = 15. Using the 68-95-99.7 rule, what percentage of scores fall between 120 and 210? Answer: 99.7
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