What is the probability of not randomly generating your cousin’s telephone number? For Exercises 17 and 18, the two statements below summarize the results of a study on the use of plus/minus grading at North Carolina State University. It shows the percents of graduate and undergraduate students who received grades with pluses and minuses (for example, etc.). (Source: North Carolina State University) • Of all students who received one or more plus grades, 92% were undergraduates and 8% were graduates. • Of all students who received one or more minus grades, 93% were undergraduates and 7% were graduates.