State which measure of center, or measure of spread, represents the situation. a company finds the difference between the lightest and the heaviest packages it ships.

The difference between the minimum data point and the maximum data point is called the range. This is a measure of spread.
Other measures of spread include the interquartile range/IQR, which helps eliminate outliers, the standard deviation, and the mean absolute deviation. Measures of central tendency include the mean, median & mode.

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.