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March 26, 2017

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Assume a family is planning to have three children.

A. What is is the probablity of a family having 2 girls.

B. The probablity of a family having at least 1 boy.


C. List the sample space using a B for Boy and G for girl (Hint there should be 8 possible outcomes).

  • Math-probablity - ,

    a) prob (2 girls out of 3) = C(3,2) (1/2)^2 (1/2)
    = 3(1/8) = 3/8

    b) at least 1 boy --- no "all girls"

    prob (all girls) = 1/8
    prob (at least 1 boy) = 1 - 1/8 = 7/8

    c)

    BBB
    BBG
    BGB
    GBB
    GGB
    GBG
    BGG
    GGG

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