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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

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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