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Math Help - Help with Sum of Sets; stats

  1. #1
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    Help with Sum of Sets; stats

    A data set contains the observations 5, 1, 3, 6, 8. Find 2.

    A data set contains the observations 4, 3, 2, 1, 8. Find .


    What is the difference between the two above questions regarding the symbols? I know is the sum of the set, but is one squared and one multiplied by two? This is hindering me because I cannot proceed to answer questions like:
    A data set contains the observations 4, 6, 5, 7, 1. Find - .

    Without knowing proper methods to answer the previous questions.
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  2. #2
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    Perhaps the first squares each term in the set before adding the set? And the second adds the set first, then squares the final answer? This seems logical.
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