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FX 300 MS Training guide
Standard Deviation
Use the [MODE] key to enter the Standard Deviation (SD) mode when you want to perform
statistical calculations using standard deviation. [MODE] [2]
• To clear statistical memory, press [SHIFT] [CLR] [1] [=].
• To enter data, use the following key sequence: <value> [DT]
• Input data is used to calculate the following values:
Sum of the squares (∑ x
2
) [SHIFT] [S-SUM] [1]
Sum of data (∑ x) [SHIFT] [S-SUM] [2]
Number of data items (n) [SHIFT] [S-SUM] [3]
Mean of the data [SHIFT] [S-VAR] [1]
Population standard deviation σ n [SHIFT] [S-VAR] [2]
Sample standard deviation σ n
-1
[SHIFT] [S-VAR] [3]
Key points to note:
• [DT] [DT] inputs the same data twice
• You can input multiple entries of the same data using [SHIFT] [;].
To input 100 ten times, press [100] [SHIFT] [;] [10] [DT]
• You can scroll through the data you entered using the up and down arrows on the
REPLAY button.
• You can edit the displayed data by inputting a new value and then pressing the [=]
key to replace it. If you use the [DT] key (and not the [=] key), this will register the
value you input as a new data item and will leave the old value as is.
• If you want to perform statistical calculations, always press the [AC] key first to exit
the data display.
• To delete a data value that is displayed, press [SHIFT] [CL].
• If you switch to another MODE, you will no longer be able to display or edit your
data.
8
References the Casio FX-300 MS User’s Guide Casio FX-300MS Scientific calculator