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Math Help - Grouped data, check answer please

  1. #1
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    Question Grouped data, check answer please

    For the grouped data

    Score Frequency
    90-100 8
    80-89 12
    70-79 26
    60-69 14
    total=60
    An estimate of the mean is____

    95*8+84.5*12+74.5*26+64.5*14=4614

    4614/60=76.9
    76.9 is my answer. Thanks very much for checking my answer. list of possible answers are -
    1. 86.75
    2. 76.9
    3. 75.0
    4. 15.0
    Last edited by kwtolley; August 9th 2006 at 09:41 AM. Reason: missing data
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by kwtolley
    For the grouped data

    Score Frequency
    90-100 8
    80-89 12
    70-79 26
    60-69 14
    total=60
    An estimate of the mean is____

    95*8+84.5*12+74.5*26+64.5*14=4614

    4614/60=76.9
    76.9 is my answer. Thanks very much for checking my answer. list of possible answers are -
    1. 86.75
    2. 76.9
    3. 75.0
    4. 15.0

    Looks OK

    RonL
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  3. #3
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    thanks ron

    thank you for checking my answer.
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