<PRE><B>Question 578138</B>
In an experiment to study the relationship of hypertention and smoking habits, the following data are collected for 180 individuals:

                               Nonsmokers        Moderate smokers      Heavysmkr
Hypertension                       21                     36              30                  
Nonhypertention                    48                     26              19               
If one of these individuals is selected at random, find the probability that the person is:

a)	experiencing hypertention, given that the person is a heavy smoker
Ans: 30/(21+36+30) = 30/87
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b)	a nonsmoker, given that the person is experiencing  no hypertention
Ans: 48/(48+26+19) = 48/93
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Cheers,
Stan H.</PRE>