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

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

Grade Numerical Score Probability
A 4 .100
B 3 .210
C 2 .390
D 1 .180
F 0 .120

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

Grade P(X≤x)
0(F)
1(D)
2(C)
3(B)
4(A)

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

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

Math   Statistics-And-Probability   
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