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Students in Math 221 were asked about the number of classes they are taking this semester. We got the following answers along with the probability

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Students in Math 221 were asked about the number of classes they are taking this semester. We got the following answers along with the probability of each: Number of 2 3 4 5 or more courses Probability 0.1 0.15 ?? 0.2 Part 1: What is the probability that a student selected at random from Math 221 is taking four classes

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