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March 27, 2017

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Mrs. Marble gave her 5th grade class a math test. The scores reflect a relatively normal distribution. The mean score for the group was 80 with a standard deviation of 8. Based upon this information, answer the following questions:

Bobby scored exactly two standard deviations above the mean. What was Bobby’s score on the test? __ ___

  • Statistics - ,

    I bet he scored 80+2*8=96

  • Statistics - ,

    z = (x-u)/S

    2 = (x-80)/8

    16 = (x-80)

    x=96

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