Twenty students take an exam in which the scores are normally…

Question Twenty students take an exam in which the scores are normally… Twenty students take an exam in which the scores are normally distributed with mean 75 and variance 64. An A is a score of 90-100, a B is 80-90, a C is 70-80, a D is 60-70 and an F is any score below 60. Let Y1 be the number of students that get an A on the exam, Y2 the number of students that get a B, Y3 the number of students that get a C, Y4 the number of students that get a D and Y5 the number of students that get an F. Find (a) p(3, 6, 8, 2, 1), (b) E[Y1], (c) V (Y2) and (d) Cov(Y3, Y4). Math Statistics and Probability MATH 380 Share QuestionEmailCopy link Comments (0)