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March 27, 2017

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A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?

  • math - ,

    It doesn't matter what µ and σ are.

    Your Z table will show you that 68.3% lie within 1σ of µ.

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