Class marks in a grouped frequency table are useful to find:

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Mean Explanation: Class Mark (xi): This is the midpoint or central value of a class interval, calculated as: Class Mark = `("Lower Limit" + "Upper Limit")/2` Finding the Mean:TgQPHd|[] When calculating the mean (barx) for grouped data, we assume that the frequency of each class is centered around its midpoint. The direct formula explicitly uses the class marks (xi): `bar(x) = (sumf_ix_i)/(sumf_i)` Median and Mode:TgQPHd|[] Calculating the median and mode of grouped data relies on class boundaries, cumulative frequencies or individual class frequencies, rather than the class marks.

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