Question

the area shaded gray in the boxplot is the *
interquartile range
mean
median
mode
outlier
standard deviation

Explanation:

In a box - plot, the box represents the interquartile range (IQR). The IQR is the range between the first quartile ($Q_1$) and the third quartile ($Q_3$). The median is shown as a line within the box. The mean is not directly represented in a standard box - plot. The mode is not a feature of a box - plot. Outliers are shown as individual points outside the whiskers. The standard deviation is not represented in a box - plot.

Answer:

interquartile range