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How many scores are between 2 standard deviations above and below the mean in a normal...

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Basic Math

  1. How many scores are between 2 standard deviations above andbelow the mean in a normal distribution?
  2. A score is 3 standard deviations above the mean in a normaldistribution. How much of the data is below that score?
  3. How many combinations can nine pair of shoes be made for ninepeople?

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