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###### Need to show work 9. The distribution of grades in the Physical Science Department at a...

Need to show work

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 A's? 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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