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Homework Help: Ti-89 Calculator question (Statistics)

  1. Mar 14, 2015 #1
    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:

    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.
  2. jcsd
  3. Mar 14, 2015 #2


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    2017 Award

    Staff: Mentor

    Which syntax error?
  4. Mar 17, 2015 #3

    Ray Vickson

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    Homework Helper

    I do not own a Ti-89, but I looked on-line for information about "Ti-89 + statistics", and found
    http://facstaff.cbu.edu/~wschrein/media/Stat/TI89man.pdf ,
    which has information about entering lists. Pages 4-5 give some examples of use.
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