Professor Sanchez has been teaching Principles of Economics

Professor Sanchez has been teaching Principles of Economics for over 25 years. He uses the following scale for grading. (Note: Grades of A, B, C, or D would allow a student to pass a pass-fail course. F represents failure.)

Use A = 4, B = 3, C = 2, D = 1, and F = 0 to convert the above probability distribution to a cumulative probability representation. (Round your answers to 2 decimal places.)

What is the probability of earning at least a B in Professor Sanchez’s course? (Round your answer to 2 decimal places.)

What is the probability of passing Professor Sanchez’s course? (Round your answer to 2 decimal places.)

Professor Sanchez has been teaching Principles of Economics for over 25 years. He uses the following scale for grading. (Note: Grades of A, B, C, or D would allow a student to pass a pass-fail course. F represents failure.)

Solution

b) Grade Probability Cumalative 0 0.1 0.1 1 0.3 0.4 2 0.4 0.8 3 0.1 0.9 4 0.1 1 c) P(probability of earning at least a B in Professor Sanchez’s ) = P(B)+P (A) = 0.3+0.1 = 0.40 d) P( passing Professor Sanchez’s course) = 1 - P(Fail) = 1 - P(F) = 1 - 0.1 = 0.90