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statistics

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the distribution of scores on a test is mound shaped and dsymmetric with a mean score of 78. if 68 percent of the scores fall between 72 and 84, what is the stand deviaition

  • statistics - ,

    Approximately 68% of scores occur between mean ± one standard deviation. Does that help?

  • statistics - ,

    the answer is the standard deviation is 6 but i don't know how to get that

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