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.

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.)

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

Explanation / Answer

Ans. (A)

(B) Atleast a 'B' means getting B or getting A = Prob of B + Prob of A = 0.24 + 0.090 = 0.33

(C) Passing the test - It means not getting F score

So, 1-prob of getting F

= 1-0.145

= 0.855

We have assumed that getting a F grade will be considered as fail.

Grade Numerical Score Probability Cumulatie Probability P(X x) F 0 0.145 0.145 D 1 0.165 0.31 C 2 0.360 0.67 B 3 0.240 0.91 A 4 0.090 1.00

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