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20. For a symmetric hell-shaped distribution we knov.T that 993% of the data fails within standard deviations of the mean; further proving the point that

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20. For a symmetric hell-shaped distribution we knov.T that 993% of the data fails within standard deviations of the mean; further proving the point that an}.F z-seore more than 3 standard deviations from the mean is considered unusual. a. one h. two c. three

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