A cumulative frequency table shows a running total of the frequencies ... This will be the median. To find the lower quartile, use the same method as for the median, except use \(\frac{1}{ ...
To find the interquartile range, subtract the value of the lower quartile ... class boundary with the cumulative frequency. The upper class boundaries for this table are 35, 40, 45, 50 and 55.
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