## TI-89 Titanium - Probability - Expected Value

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 of n outcomes with their respective probabilities (also in a single matrix) it should look something like this: $\begin{pmatrix} 1 & 1/6 \\ 2 & 1/6 \\ 3 & 1/6 \\ 4 & 1/6 \\ 5 & 1/6 \\ 6 & 1/6 \end{pmatrix}$ To find the expected value I would need to do: $(1 \times 1/6) + (2 \times 1/6) + ... + (6 \times 1/6) = E(X)$ Basically, multiply each outcome with its probability and finally sum the whole lot... IDEALLY...I would like to be able to make a single 2*n matrix with outcomes and probabilities side-by-side, store it as A and be able to do: Code: expval(A). or...which is faster to type: make a n*2 matrix! Anyways...sorry for the long post, any help will be much appreciated!!!!
 PhysOrg.com science news on PhysOrg.com >> King Richard III found in 'untidy lozenge-shaped grave'>> Google Drive sports new view and scan enhancements>> Researcher admits mistakes in stem cell study