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Math Help - Standard Dev and mean of continous data

  1. #1
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    Standard Dev and mean of continous data

    Salary/Frequency
    20-34/4
    35-49/20
    50-54/41
    55-59/25
    60-64/3
    65-69/6
    70-74/8

    How do I find the std dev and mean of the above data?
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  2. #2
    Senior Member vincisonfire's Avatar
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    Proceed as usual but take the midpoint of the classes as your data value.
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