Bunuel wrote:
In a population of 100,000 males, 80% can be expected to live to age 60 and 60% can be expected to live to 80. Given that a male in this group is 60, what is the probability that he lives to 80?
A. 48%
B. 60%
C. 75%
D. 78%
E. 80%
Since 80% and 60% are expected to live to ages 60 and 80, respectively, 80,000 and 60,000 males are expected to live to ages 60 and 80, respectively. Thus, the probability that a male lives to age 80, given that he is 60, is:
60,000/80,000 = 3/4 = 75%
Answer: C
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