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March 27, 2017

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Suppose x is a random variable with mean and standard deviation. If a large number of trials is observed, at least what percentage of these values is expected to lie beween mean-2(standard deviation) and mean + 2(standard deviation)

could someone help me i'm so lost? thank you sooooo much!!!

  • math - ,

    Memorize it. Two standard deviations contain 95 percent of the population.

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