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Mathematics 8 Online
OpenStudy (anonymous):

NEED STAT HELP PLEASE!!! 1) A company sells annuities must base the annual payout on the probability distribution of the length of life of the participants in the plan. Suppose the probability distribution of lifetimes of the male participants is approximately normal with a mean equal to 66.3 years and that of the female participant is the same with a mean of 68 years. It can be assumed that the standard deviation of the male lifetimes equals 1.2 times that of the female. If the probability of a randomly selected female outliving a randomly selected male is equal to 0.8413, find the standard deviation of male lifetime

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