Finding the mean of a discrete random variable (TI83+)

Your starting information should include the differant values of variable 'x' and the corresponding probabilities 'p(x)'. The sum of p(x) should equal 1.

Ex.

The formula for finding the mean of these values is μ = ΣxP(x).

To enter this equation into the graphing calculator, do the following:
 * 1) Go to STAT>EDIT>Edit
 * 2) Enter the values of x in the L1 column, and the values for p(x) in the L2 column
 * 3) Label the L3 column as L1*L2
 * 4) Return to the home screen
 * 5) Go to LIST(2nd-STAT)>MATH>sum(
 * 6) Press L3(2nd-3) and ) to make the equation 'sum(L3)'. Press ENTER
 * 7) The answer will be the value of μ = ΣxP(x)