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Recent activity by Mike Banks

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What is the rule that determines percentages with the mean +- 1,2 or 3 standard deviations?
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What is a discrete random variable?
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What is the difference between permutation and combination?
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What is the difference between Qualitative and Quantitative data?
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What is the difference between the mean and the median? Calculate both for the following number set {18, 24, 19. 16. 21}