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Math Help - Survival function

  1. #1
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    Survival function

    If the survival times of 10 lives in a survivorship group are independent with survival defind in [table in our book], exhibit the p.f. of L(65) and the mean and variance of L(65).

    I found the mean to be E[L(65)] = l0[65P0] = l65 = 7.7107 , which I know is correct but I'm not sure how to get the variance. Thanks!
    Last edited by bart203; September 22nd 2009 at 06:58 PM.
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