The table below describes the smoking habits of a group of a

The table below describes the smoking habits of a group of asthma sufferers.

Heavy Smoker

Women

If two different people are randomly selected from the 933 subjects, find the probablility that they are both heavy smokers. Round to six decimal places.

A) 0.006462      B) 0.0001778 C) 0.006383                   D) 0.002026

Solution

here the total heavy smookers are 75 and the probability of being a heavy smooker is 75/933

the probability of choosen 2 people both being the heavy smoker is (75/933)^2 = 0.006462