# Mean, Sum & Count - fx-82ES - Casio Calculator Tutorials

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:

$$\large{\{50,63,54,80\}}$$

- Enter \(\text{STAT}\) mode by pressing \(\fbox{MODE}\ \fbox{2}\).
- Select \(\text{1-VAR}\) by pressing \(\fbox{1}\).
- Enter the values in the set of data, using \(\fbox{=}\) to move down to the next cell. Use \(\color{navy}{\fbox{↑}}\) and \(\color{navy}{\fbox{↓}}\) to move up and down to correct inaccuracies.
- Press \(\color{maroon}{\fbox{AC}}\) to exit the data.

The sum of the data is shown using

\(\color{#A80}{\fbox{SHIFT}}\ \fbox{1}\ \fbox{4}\) (\(\text{Sum}\)) \(\fbox{2}\) (\(\sum x\)).

The mean of the data is shown using

\(\color{#A80}{\fbox{SHIFT}}\ \fbox{1}\ \fbox{5}\) (\(\text{Var}\)) \(\fbox{2}\) (\(\overline X\)).

The number of values \(n\) is shown using

\(\color{#A80}{\fbox{SHIFT}}\ \fbox{1}\ \fbox{5}\) (\(\text{Var}\)) \(\fbox{1}\) (\(n\)).