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## Main Question or Discussion Point

**EDIT: I found the solution, it can be done using the TwoVar() function on the TI-89 and it gives you a whole lot more than just the expected value. thanks anyways**

Hello everyone! :)

I hope I will get an answer for this!

As a USER-DEFINED function I would like to be able to calculate the Expected Value ofnoutcomes with their respective probabilities (also in a single matrix)

it should look something like this:

[itex]\begin{pmatrix}

1 & 1/6 \\

2 & 1/6 \\

3 & 1/6 \\

4 & 1/6 \\

5 & 1/6 \\

6 & 1/6 \end{pmatrix}[/itex]

To find the expected value I would need to do:

[itex](1 \times 1/6) + (2 \times 1/6) + ... + (6 \times 1/6) = E(X)[/itex]

Basically, multiply eachoutcomewith itsprobabilityand finallysumthe whole lot...

IDEALLY...I would like to be able to make a single 2 x n matrix with outcomes and probabilities side-by-side, store it asAand be able to do:or...which is faster to type: make a n*2 matrix!Code:`expval(A)`

Anyways...sorry for the long post, any help will be much appreciated!!!!

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