https://www.studocu.com/hk/document/city-university-of-hong-kong/probability-and-statistics/midterm-exam-solutions/88317793?origin=university-course-page



https://www.studocu.com/hk/document/city-university-of-hong-kong/probability-and-statistics/midterm-exam-solutionspdf/88317788?origin=university-course-page