quartile • box-and-whisker plot • interquartile range For the data below, find the median (Q2), first quartile (Q1), and third quartile (Q3). 39 27.5 Of the 25 test scores, 15 scores are less than or equal to 85. ... Step 3 Draw a number line. 20 40 60 80 100 120 140 160 180 200 220.