Sara Goldan is heading a fund - raising drive for Mildford College . She wishes to concentrate on the current tenth - reunion class and hopes to get contributions from percent of the 250 members of that class . Past data indicates that those who contribute the twenty year reunion gift will donate 4 percent of their annual salaries . Sara believes that the reunion class members ' annual salaries have an average of $ 32,000 and standard deviation of . If her expectations are met ( 36 percent of class donates 4 percent of their salaries ) , what is the probability that the tenth - reunion gift will be between $ 110,000 and $ 120,000 ?