probability

I am lost. How do I figure this out? I know there are 2 ways to get the sum of 5 but do I count it backwards too? 1+4 4+1. How do I know how many sums?

Joe rolled two fair number cubes that have faces labeled 1 to 6 each.
He rolled the two cubes 180 times. According to the theoretical probability,
how many of the rolls should Joe expect the sum to be 5?

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asked by MAGGIE
  1. -->1 2 3 4 5 6

    1 ----- *
    2 ----*
    3 --*
    4 *
    5
    6

    36 possible outcomes
    get 5 from four of them
    so p = 4/36 = 1/9
    (1/9)180 = 20 times

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    posted by Damon

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