Frequency Distribution

Find quartiles and calculate the interquartile range

Estimate and interpret percentiles

The range (maximum value - minimum value) shows how dispersed various data sets were

The range affected by outlier

The cumulative frequency graph can be divided into four equal parts, called quartiles, to get interquartile range

Interquartile range is used to measure how spread the data was, and more representative than the range because not affected by extreme values