I noticed that there is actually an explanation on how to calculate the variance on the movable plastic box cover of the calculator.

Where the standard deviation is the standard deviation and the square of the standard deviation is the variance.

Let me translate:

First, open the calculator, press MODE, options will appear on the screen, and press 2 to select the second item, which will enter the statistical calculation mode.

Then input data, and press M+ after each data is typed.

After all the data is input, calculate the variance. Press SHIFT2 and an option will appear on the screen. Select the second item and press 2.

At this point, it is displayed at the top of the screen.

xσn

This means standard deviation. Since the variance is the square of the standard deviation, you need to press the square key x2, and finally press = to calculate the variance of the input data and display it at the bottom of the screen.