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Q20; Suppose that we gathered data from last year's final chemistry exam and found it followed a normal distribution with a mean of u =68

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Q20; Suppose that we gathered data from last year's final chemistry exam and found it followed a normal distribution with a mean of u =68 and a standard deviation of 6=9 nifiz What proportion of students score's between X= 72 and X= 86 ? Mean =68 X-score Mean =0 Z-score

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