Professor Sanchez has been teaching Principles of Economics for over 25 years. H

Question

Professor Sanchez has been teaching Principles of Economics for over 25 years. He uses the following scale for grading.

Part (a) omitted

Convert the above probability distribution to a cumulative probability distribution. (Round your answers to 3 decimal places.)

What is the probability of earning at least a B in Professor Sanchez’s course? (Round your answer to 3 decimal places.)

What is the probability of passing Professor Sanchez’s course? (Round your answer to 3 decimal places.)

Grade Numerical Score Probability A 4 0.090      B 3 0.240      C 2 0.390      D 1 0.160      F 0 0.120     

Explanation / Answer

Grade Numerical Score Probability Cumlative Probability A 4 0.09 0.09 B 3 0.24 0.33 C 2 0.39 0.72 D 1 0.16 0.88 F 0 0.12 1 b) P( Atleast B) = 1 - P(A) = 1 - 0.09 = 0.91

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