MAT 1272 Statistics, SP2014

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  • #13787

    Ezra Halleck
    Participant

    4) According to the NIH, 32% of all women will fracture their hip by age 90. If 8 women aged 90 are selected at random, what is the probability that exactly 5 of them will have suffered a hip fracture?

    #17972

    YinYin A. Li
    Participant

    p=0.32 ; q=0.68; n=8; r=5
    (nCr)(p^r)[q^(1-r)]
    (8C5)(0.32^5)(0.68^3)=0.059

    #17986

    Oruada
    Participant

    How did you get q=0.68?

    #17987

    Chana Max, RN
    Participant

    It took me a while to figure out where we learnt how do do this example.
    To get q you do 1-p so in this case 1-0.32 = 0.68 also the equation is written wrong. It is (nCr) (p^r) (q^n-r) so (8nCr5)(0.32^5)(0.68^3)=0.059 or 5.9%

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