Q3. The weight of a random sample of 100 patients was recorded. There was only one patient who was heaviest (weight 300 pounds) and only one patient who was lightest (weight 100 pounds) in weight in the sample. All patients in the sample were put on diet for one month to lose their weight. The heaviest patient gained weight by 20 pounds and lightest patient lost weight by 20 pounds. The weight of others did not change. The values of the statistics before and after diet in the following statements remain unchanged a. The variance b. The coefficient of variation c. The inter quartile range d. All of them in a, b, c remained unchanged 4. In a community, it is found that 45% are smokers and others are non-smokers, 60% have lung cancer and others have no lung cancer. It is known that smoking habits are independent of lung cancer disease. An individual from the community is selected at random, the probability that the individual will be either smoker or have lung cancer or have both is a. 0.78 b. 1.05 c. 0.88 d. 0.27