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12. A score that is 6 points below the mean corresponds to a z-score of z = - 2.00. What is the population standard deviation?

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12. A score that is 6 points below the mean corresponds to a z-score of z = - 2.00. What is the population standard deviation? 22. For the following, identify the exam score that should lead to the better grade and explain. A score of X - 74 on an exam with u - 82 and o = 8; or a score of X = 40 on an exam with u = 50 and o= 20. Which exam produces the higher score and why

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