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Answer: B) Median</h3>
The middle vertical line inside the box is the median or the value of Q2. The term "median" is used more often instead of Q2, but your book may use this terminology as well.
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side notes:
* The left and right edges of the box are Q1 and Q3 respectively
* The IQR (interquartile range) is found by subtracting Q3 and Q1
* The min and max are the left and right most edges of the the whiskers, this is assuming there are no outliers
* There is no way to get the mean or mode from a box and whisker plot alone.
* The term "average" is too vague and could refer to mean, median, or mode.
