(1 Point for part a,1 point for part b;total 2 points)Researchers at George Washington Universityand the National Institutes of Health claim that approximately75%of people believe“tranquilizers workvery well to make a person more calm and relaxed.”Of the next 80 people interviewed,without using Rcommands calculate the probability thata.at least 50 are of this opinion?b.at most 56 are of this opinion?
题目答案请扫描下方二维码查看。
