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

Turn your calculator on
	Press .
Clearing the memory
	Press .

Entering data
	one variable
		Press . (This gets you into STAT mode - you'll see STAT in a black rectangle on the screen.)  Enter the first number in your list. Press . Enter the second number in your list. Press . Continue until the end of the list.
	two variables
		The EL-506M does not do two-variable statistics.

Calculating one-variable statistics
	mean (x)
		Press (you should see x above the key).
	standard deviation for populations (s or sn)
		Press (you should see sx above the key).
	standard deviation for samples (s or sn-1)
		Press (you should see sx above the key).

Calculating combinations and permutations
	combinations (nCr)
		Enter the n value. Press (you should see a C in the lower right corner of the screen). Enter the r value and press .
	permutations (nPr)
		Enter the n value. Press (you should see a P in the lower right corner of the screen). Enter the r value and press .

Turning the calculator off
	Press (you should see OFF written above the key).

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 e^x as (e^x).

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

15      16      20      21

1: Clear Memory
2: Enter the data
3: Compute the mean	(x)
4: Compute the population standard deviation.	(sx)
5: Compute the sample standard deviation:	(sx)

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

1: Compute 10C6	(nCr)
2: Compute 9P5	(nPr)

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

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