Each student in a certain high school was classified acc
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Each student in a certain high school was classified according to her year in school (freshman, sophomore, junior, or se
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Each student in a certain high school was classified according to her year in school (freshman, sophomore, junior, or senior) and according to the number of times that she had visited a certain museum (never, once, or more than once). The proportions of students in the various classifications are given in the following table: More Never Once than once Freshmen 0.08 0.10 0.04 Sophomores 0.04 0.10 0.04 Juniors 0.04 0.20 0.09 Seniors 0.02 0.15 0.10 a. If a student selected at random from the high school is a junior, what is the probability that she has never visited the museum? b. If a student selected at random from the high school has visited the museum three times, what is the probability that she is a senior?
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