The position of the graphically represented keys can be found by moving your mouse on top of the graphic.
The rounded bullet shaped keys on top do not count as rows.

 Turn your calculator on Press . Clearing the memory The memory is automatically cleared when you leave the STAT mode.

 Entering data one variable Press (You should see STAT above the key. STAT will also appear on the screen.) Press and enter the first number in your list. Enter the other numbers in your list, pressing before each one. (Note that this is opposite the usual order.) two variables The HP 9s does not do regression.

 Calculating one-variable statistics mean (x) Press . You should see x above the key on the left. standard deviation for populations (s or sn) Press  . You should see s in a box above the key. standard deviation for samples (s or sn-1) Press . You should see s above the key.

 Calculating two-variable statistics r (correlation) The HP 9s does not do regression. regression coefficients slope The HP 9s does not do regression. y-intercept The HP 9s does not do regression.

 Calculating combinations and permutations combinations (nCr) Enter n. Press (you should see nCr above the key). Enter r and press . permutations (nPr) Enter n. Press (you should see nPr above the key). Enter r and press .

 Turning the calculator off Press .

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 2: Enter Data (STAT) 3: Compute the mean ( x ) 4: Compute the population standard deviation (s) 5: Compute the sample standard deviation (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 (nCr) 2: Compute 9P5 (nPr)

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

Go to: