1. The problem statement, all variables and given/known data Calculate the mean and standard deviation for the random variable X which equals the sum of the dots facing upward when two standard six-sided dice are rolled. 3. The attempt at a solution In List 1, I entered all the possible values of the random variable X: 2,3,4,5,6,7,8,9,10,11,12 the probability distribution formula I was given is Px = (6-abs(7-X))/36 So then for List 2 I entered (6-abs(7-List1))/36 Thus now in List 2 I have the probability for each of the possible random variable values. Up to this point I have exactly what my professor has. Next my professor (using a Ti84) goes back to the home screen and enters "1-Var Stats L1,L2" for List 1 and 2 respectively and then obtains the necessary values. I am using a Ti-89, so upon entering my values I went to F-4 --> 1-Var Stats---> and under "List:" I entered L1,L2 (the names of my list) and it gave me a syntax error. Thank you for any input.