A student goes to class on a snowy day with probability 0.4, but on a non snowy
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A student goes to class on a snowy day with probability 0.4, but on a non snowy day attends with probability 0.7. Suppose that 20% of the days in February are snowy. What is the probability that it snowed on February 7 given that the student was in class on that day?
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