Suppose we examined medical records of 500 individuals admitted to the hospital, and we cross-classified them by whether they had lung disease or some other disease and the number of cigs they smoked daily. The individuals in the sample were distributed as follows 1.What proportion of the sample both had lung cancer and smoked 25 or more cigs per day? 2.Of all individuals who had lung cancer, what proportion smoked fewer than 25 cigs per day? 3.What proportion of individuals in the sample smoked fewer than 25 cigs per day?

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