Answer
$3.88\,\rm mm^{2}.$
Increases if the largest measurement is doubled.
Work Step by Step
The variance has the square of the units of measure of the data items in the sample (here: square millimeters, or $\rm mm^{2}$).
It can be obtained by invoking the "Descriptive Statistics" option of our Data Analysis feature to obtain a summary shown below in the attached screen snippet on the left.
The variance is
$$s^{2}=3.88\,\rm mm^{2}.$$
If we doubled the largest measurement, and calculate the variance again (see the snippet on the right), it becomes $$s^{2}=32.86\,\rm mm^{2}.$$
That is, it would increase.
