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Math Help - Probability Help!

  1. #1
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    Probability Help!

    Hi, I need help with a probability problem. I am unsure how to work it as it doesn't tell you how many are in the group of men?? Any help would be appreciated. Thanks!

    According to a certain book, men have 14.334% chance of dying at age 90. A group of 90 year old men meet monthly to discuss philosophy and politics. They are discussing the possibility of some of their group dying this year. If 2 men are chosen at random from the group, what is the probability that both of the 2 men will die this year?
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  2. #2
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    Re: Probability Help!

    Hey Kibbygirl.

    For your problem, the first thing you need to figure out is whether each death is independent from all of the others.

    Under the independence criterion P(A and B) = P(A)P(B), but if they are not independent, then you need to find the joint distribution P(A = a, B = b) = f(a,b) where f is some valid probability function.

    Under independence f(a,b) = f(a)g(b) and both functions are equal to 0.14334 given your data.
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  3. #3
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    Re: Probability Help!

    Well I ended up getting the first tries wrong and it said to first figure out the probability of each man dying and then carry on to find out the probability of two men dying by using the fundamental counting principle. What is the formula to figure out each man dying?
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  4. #4
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    Re: Probability Help!

    What was your answer and how did you obtain/calculate it?
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