Box & Whisker Plots Examples Page 1

This plot represents the amount of money Mateo earned the past 18 weeks working at this dad's shop.  Create a box and whisker plot of this data.

12|0 represents $120

The median (Q2) is between 136 and 137. It is 136.5.
The lower quartile (Q1) is 130.
The upper quartile (Q3) is 143.

Now, we need to check for any outliers; 165 looks suspiciously high, but we always need to check.

IQR is 143 – 130 = 13
1.5(IQR) = 19.5
143 + 19.5 = 162.5

165 is higher than this, so it is an outlier.

Here is what the plot should look like: