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9. The distribution of grades in the Physical Science Department at a large university is given in the following table. Grades are represented by numerical values according to the scale. A-4, B Grade Probability 0.10 0.12 0.35 0.30 (a) Define an appropriate random variable and its range. (b) what percent of the grades are As? Answer: 13% (c) What is the probability that a randomly chosen student taking a class in the Physical Science Department will obtain a grade of C or better? Answer: 0.78 (d) Construct a histogram for this probability distribution. (4.1.2)

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