A group of random selected 1,000 adults are classified into 4 smoking groups: abstainers, light, moderate, heavy. At the end of a ten-year period, the proportion in each group who did and did not develop lung cancer was determined. The null hypothesis is that all 4 groups will have the same incidence of lung cancer.

Ten percent of this sample developed cancer during the 10-year period. Two hundred of the adults in this sample were abstainers. How many abstainers do you expect to develop lung cancer if cancer incidence is not related to smoking?