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May 13th, 2013, 04:20 PM   #1
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Probability Risk Factors

A woman at a doctor's office has many patients. She is studying two risk factors, A and B.

The woman determines that 60% of people do not have risk factor A.
She also determines that 36% of people do not have risk factor A or B.

If the chance of having risk factor A is independent of the chance of having risk factor B, what is the probability that a randomly selected patient has risk factor A and B?

Show your work please.
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May 14th, 2013, 05:16 AM   #2
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Re: Probability Risk Factors

Is that all of the information you were given?
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May 14th, 2013, 07:14 AM   #3
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As 36% is 60% of 60%, 40% of the people have risk factor B, so 40% of the 40% who have risk factor A also have risk factor B. Hence the required probability is 16%.
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May 15th, 2013, 06:22 AM   #4
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Re: Probability Risk Factors

the answer is 0.256
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