The HP12C Platinum has the same instructions. 
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 4, Column 1.
Clearing the memory
Press The f key: Row 4, Column 2 S S T Key: Row 3, Column 2 (You should see a S on top.) 

 

Entering data
one variable
Enter the first number in the list. Press The Sigma Plus Key: Row 4, Column 9. Enter the second number in the list and press The Sigma Plus Key: Row 4, Column 9. Continue for all numbers in the list.
two variables
Enter the first y-value in the list and press The Enter Key: Rows 3 and 4, Column 6 (Tall Key). Enter the first x-value in the list and press The Sigma Plus Key: Row 4, Column 9. Type in each ordered pair in the same fashion - y-value first,The Enter Key: Rows 3 and 4, Column 6 (Tall Key), x-value last, The Sigma Plus Key: Row 4, Column 9.

 

Calculating one-variable statistics
mean (x)
Press The g key: Row 4, Column 3 The Zero Key: Row 4, Column 7. (You should see x below the 0.)
standard deviation for populations (s or sn)
There's no direct key for s, but here's a fancy way around that. Press The g key: Row 4, Column 3 The Zero Key: Row 4, Column 7 The Sigma Plus Key: Row 4, Column 9 The g key: Row 4, Column 3 The Decimal Point Key: Row 4, Column 8.
standard deviation for samples (s or sn-1)
Press The g key: Row 4, Column 3 The Decimal Point Key: Row 4, Column 8. (You should see an s below the decimal point.)

Calculating two-variable statistics
For the regression coefficients, there are no direct commands. But there is a command to plug any number into the regression equation. The commands below take advantage of that to compute the slope and y-intercept.
r (correlation)
Press The Zero Key: Row 4, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 (you should see ,r under the 2) The X Swap Y Key: Row 3, Column 4.
regression coefficients
slope
Press The Zero Key: Row 4, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 you should see ,r under the 2.
y-intercept
Press The One Key: Row 3, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 The X Swap Y Key: Row 3, Column 4 The R Down Key: Row 3, Column 3 The X Swap Y Key: Row 3, Column 4 The Minus Key: Row 3, Column 10.


Calculating combinations and permutations
Again, the HP 12C has no direct commands, but we can use the factorial button to compute nCr and nPr.
combinations (nCr)
Enter the n-value. Press The g key: Row 4, Column 3 The Three Key: Row 3, Column 9. Enter the r-value. Press  The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10. Enter the difference between n and r. Press  The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10.
permutations (nPr)
Enter the n-value. Press The g key: Row 4, Column 3 The Three Key: Row 3, Column 9. Enter the difference between n and r. Press  The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10.

 

Turning the calculator off
Press The f key: Row 4, Column 2 The On Key: Row 4, Column 1.

 

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 f key: Row 4, Column 2 S S T Key: Row 3, Column 2 (S) 
2: Enter Data  The One Key: Row 3, Column 7 The Five Key: Row 2, Column 8 The Sigma Plus Key: Row 4, Column 9 The One Key: Row 3, Column 7 The Six Key: Row 2, Column 9 The Sigma Plus Key: Row 4, Column 9 The Two Key: Row 3, Column 8 The Zero Key: Row 4, Column 7 The Sigma Plus Key: Row 4, Column 9 The Two Key: Row 3, Column 8 The One Key: Row 3, Column 7 The Sigma Plus Key: Row 4, Column 9
3: Compute the mean   The g key: Row 4, Column 3 The Zero Key: Row 4, Column 7 (x)
4: Compute the population standard deviation  The g key: Row 4, Column 3 The Zero Key: Row 4, Column 7 The Sigma Plus Key: Row 4, Column 9 The g key: Row 4, Column 3 The Decimal Point Key: Row 4, Column 8
5: Compute the sample standard deviation  The g key: Row 4, Column 3 The Decimal Point Key: Row 4, Column 8 (s)


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

B: Find the linear regression line for the following table of numbers.  Also find the correlation.

x 1 2 3 4
y 2 4 5 7

1: Clear Memory  The f key: Row 4, Column 2 S S T Key: Row 3, Column 2 (S) 
2: Enter Data  The Two Key: Row 3, Column 8 The Enter Key: Rows 3 and 4, Column 6 (Tall Key) The One Key: Row 3, Column 7 The Sigma Plus Key: Row 4, Column 9 The Four Key: Row 2, Column 7 The Enter Key: Rows 3 and 4, Column 6 (Tall Key) The Two Key: Row 3, Column 8 The Sigma Plus Key: Row 4, Column 9 The Five Key: Row 2, Column 8 The Enter Key: Rows 3 and 4, Column 6 (Tall Key) The Three Key: Row 3, Column 9 The Sigma Plus Key: Row 4, Column 9 The Seven Key: Row 1, Column 7 The Enter Key: Rows 3 and 4, Column 6 (Tall Key) The Four Key: Row 2, Column 7 The Sigma Plus Key: Row 4, Column 9
3: Compute the slope of the regression line  The Zero Key: Row 4, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 
4: Compute the y-intercept of the regression line  The One Key: Row 3, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 The X Swap Y Key: Row 3, Column 4 The R Down Key: Row 3, Column 3 The X Swap Y Key: Row 3, Column 4 The Minus Key: Row 3, Column 10 
5: Compute the correlation  The Zero Key: Row 4, Column 7 The g key: Row 4, Column 3 The Two Key: Row 3, Column 8 The X Swap Y Key: Row 3, Column 4 


    You should get a slope of 1.6, a y-intercept of 0.5, and a correlation of 0.992277876.
    The regression line would be: y = 1.6x + 0.5.

C: Find 10C6 and 9P5.
1:Compute 10C6

 The One Key: Row 3, Column 7 The Zero Key: Row 4, Column 7 The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 (n!) The Six Key: Row 2, Column 9 The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10 The Four Key: Row 2, Column 7 (10 - 6 is 4) The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10
2: Compute 9P5  The Nine Key: Row 1, Column 9 The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 (n!) The Four Key: Row 2, Column 7 (9 - 5 = 4) The g key: Row 4, Column 3 The Three Key: Row 3, Column 9 The Divided By Key: Row 1, Column 10 


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

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