Cumulative Assessment
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The interquartile range (IQR) is the difference of the third quartile and the first quartile.
C
We will begin by looking at the box-and-whisker plot that represents the lengths (in minutes) of project presentations at a science fair.
We are asked to find the interquartile range of the data and what it represents in this situation. The interquartile range (IQR) is the difference of the third quartile Q_3, and the first quartile Q_1. In this case, Q_3 is 7 and Q_1 is 4. Let's calculate it! IQR: 7- 4=3minutes This means that the middle half of the presentation lengths vary by no more than 3 minutes, which is given in option C.