The first step: Press 2ndf +on/c to enter the statistics mode

The second step: Enter all the values ????in sequence. After each value is entered, press the M+ key, and the screen will Displays which value this is entered, and then continues to the next value.

Step 3: After entering all the values, you can directly click on the required statistical value. For example, press RM to display the variance s, and 2ndf +RM to display the standard deviation.