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Math Help - Mean for grouped data

  1. #1
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    Mean for grouped data

    I understand that when finding the mean for grouped data,
    with class interval, e.g. 0 \le x < 5, we use the midpoint of the interval, then multiply by frequency, and so on...

    My question is this,

    If x is discrete, for the range 0\le x < 5, then x takes values 0, 1, 2, 3, 4. Should we choose 2 for the midpoint? or 2.5?

    Which one better?

    Thanks!!!
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  2. #2
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    In this case the range is actually equal to 0 < x < 4 (those should be less than-or-equal signs but not sure how to do them on here), and the midpoint of that range is 2. So use 2.
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