What is the area within 1 standard deviation from the mean of a normal curve? a. 95.44% b. 62.86% c. 68.26% d. 99.74% What is the area within 3 standard deviations from the mean of a normal curve? a. 97% b. 95% c. 99.7% d. 68% If u = 40, a = 4, what is the corresponding z-score of a raw x= 52?

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