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Identifying Discrete and Continuous Random Variables. In Exercises 5 and 6, refer to the given values, then identify which of the following is most appropriate: discrete random variable, continuous random variable, or not a random variable.
6. a. Grades (A, B, C, D, F) earned in statistics classes
b. Heights of students in statistics classes
c. Numbers of students in statistics classes
d. Eye colors of statistics students
e. Numbers of times statistics students must toss a coin before getting heads
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