The position of the graphically represented keys can be found by moving your mouse on top of the graphic. 

Turn your calculator on
Press The On Key: Row 1, Column 6.
Clearing the memory
Press The Mode Key: Row 1, Column 2 The Decimal Point Key: Row 7, Column 2 to get into the stat mode.  Then press Top Leftmost. It's a gray key. Row 4, Column 5 (you should see scl above the key).

 

Entering data
one variable
Type in first value, then press Row 7, Column 5.  Type in second value, press Row 7, Column 5.  Repeat until all the data has been entered.
two variables
The Casio fx-260 Solar does not do two variable statistics.

 

Calculating one-variable statistics
mean (x)
Press Top Leftmost. It's a gray key. Row 4 Column 1 (you should see x above the key).
standard deviation for populations (s or sn)
Press Top Leftmost. It's a gray key. Row 4, Column 2 (you should see sn above the key).
standard deviation for samples (s or sn-1)
Press Top Leftmost. It's a gray key. Row 4, Column 3 (you should see sn-1 above the key).

Calculating two-variable statistics
r (correlation)
The Casio fx-260 Solar does not do regression.
regression coefficients
slope
The Casio fx-260 Solar does not do regression.
y-intercept
The Casio fx-260 Solar does not do regression.


Calculating combinations and permutations
combinations (nCr)
Enter the n value.  Press Row 1 Column 1 Row 6, Column 2 (you should see nCr above the 2 key).  Enter the r value.  Press Bottom right.
permutations (nPr)
Enter the n value. Press Row 1 Column 1 Row 6, Column 1 (you should see nPr above the 1 key) followed by the r value. Press Bottom right.

 

Turning the calculator off
This is a solar calculator.  You can't turn it off.  EVER! (okay, it shuts down after two minutes of non-use).

 

Worked Out Examples

In the following examples, we list the exact key sequence used to find the answer.  We will list the keys by the main symbol on the key.  In parentheses, we will list a helpful mnemonic, e.g. we will list ex as (ex).


A: What is the mean and standard deviation of the following list of numbers?

15      16      20      21

1: Clear Memory  The Mode Key: Row 1, Column 2 The Decimal Point Key: Row 7, Column 2 Top Leftmost. It's a gray key. Row 4, Column 5
2: Enter the data  Row 6, Column 1 Row 5, Column 2 Row 7, Column 5 Row 6, Column 1 Row 5, Column 3 Row 7, Column 5 Row 6, Column 2 
 Row 7 Column 1 Row 7, Column 5 Row 6, Column 2 Row 6, Column 1 Row 7, Column 5
3: Compute the mean  Top Leftmost. It's a gray key. Row 4 Column 1 (x)
4: Compute the population standard deviation.  Top Leftmost. It's a gray key. Row 4, Column 2 (sn)
5: Compute the sample standard deviation:   Top Leftmost. It's a gray key. Row 4, Column 3 (s)


    You should get a mean of 18, population standard deviation of 2.549509757 and a sample standard deviation of 2.943920289.

C: Find 10C6 and 9P5.
1: Compute 10C6  Row 6, Column 1 Row 7 Column 1 Row 1 Column 1 Row 6, Column 2 (nCr) 
 Row 5, Column 3 Bottom right
2: Compute 9P5  Row 4, Column 3 Row 1 Column 1 Row 6, Column 1 (nPr) Row 5, Column 2 Bottom right


You should get 10C6 = 210 and 9P5= 15120.

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