Calculating the mean or sum of a set of data, or even counting the set of data for use in other formula is easy with Stat mode, available on both types of calculator.
For example, I will calculate the mean and sum of the following set:
- Enter STAT mode by pressing MODE 2.
- Select 1-VAR by pressing 1.
- Enter the values in the set of data, using = to move down to the next cell.
Use ↑ and ↓ to move up and down to correct inaccuracies.
- Press AC to exit the data.
The sum of the data is shown using
SHIFT 1 4 (Sum) 2 (∑x).
The mean of the data is shown using
SHIFT 1 5 (Var) 2 (X¯).
The number of values n is shown using
SHIFT 1 5 (Var) 1 (n).