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Math Help - Probability Teaser Question

  1. #1
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    Probability Teaser Question

    What is the average age to which a 90-year old man will live, given that the probability a person age x will die before age x+1 is (x - 89) / 5?

    A. 91
    B. 91.5
    C. 92
    D. 92.5
    E. 93

    Thanks!
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  2. #2
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    Correct e if i'm wrong

    Quote Originally Posted by feiyingx View Post
    What is the average age to which a 90-year old man will live, given that the probability a person age x will die before age x+1 is (x - 89) / 5?

    A. 91
    B. 91.5
    C. 92
    D. 92.5
    E. 93

    Thanks!
    (4/5)x91+(4/5)(3/5)x92+(4/5)(3/5)(2/5)x93+(4/5)(3/5)(2/5)(1/5)x94

    92.4896
    ~92.5
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