Frequency Distribution Example: State University, 3000 students, management science grades for past four years. What is the probability that a student will get a grade of C or higher? Event Number of Students Relative Probability Cumulatlve Grade Frequency Probability A 300 B 600 C 1,500 D 450 F E 3,000 Independent Events Probability Trees Example: For a coin tossed three consecutive times what is the probability of getting a head on 1St toss, tail on 2nd, and tail on the 3'\