- #1

AKJ1

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## Homework Statement

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.

## 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.