The Casio FX-9750GA is a handheld graphing calculator that can plot graphs, compile tables and perform a variety of basic statistical calculations, including standard deviations, a measure of how spread out data points are around the population's mean value. In order to find the standard deviation of a set of data, you must first enter the data into a list.

- Skill level:
- Moderately Challenging

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## Instructions

- 1
Select "Stat" from the main menu to display the data lists.

- 2
Type your data into the lists. For example, type your "X" data into List 1 and your "Y" data into List 2. Move through the rows and columns with the arrow keys.

- 3
Press the "F4" key.

- 4
Select "(1Var)" and press "Enter." The 1-Variable screen appears with the sample standard deviation listed as "Xsigman-1."

#### Tips and warnings

- Don't leave any blank rows between values when entering your data; the calculator will take the value as zero and skew your result.