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Math Help - cumulative freqency

  1. #1
    Member helloying's Avatar
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    cumulative freqency

    for eg. the length of 30 nails were measured. their lengths are represented in a table with for eg. 0 to 4 cm ,frequency of 14. the qn asked me to draw a histogram and then find the mean length of the nails.i dont know how to determine the mean length. what should i do?
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  2. #2
    MHF Contributor
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    Quote Originally Posted by helloying View Post
    for eg. the length of 30 nails were measured. their lengths are represented in a table with for eg. 0 to 4 cm ,frequency of 14. the qn asked me to draw a histogram and then find the mean length of the nails.i dont know how to determine the mean length. what should i do?

    Mean =\frac{\sum fx}{\sum f}

    Take midpoints of every class for x .
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