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Mark is late to class every day with a probability of 0.2. a) What is the probability that he was at most one working day

Mark is late to class every day with a probability of 0.2.

a) What is the probability that he was at most one working day late to class?

b) For which the maximum number of working days can we be at least 90% sure that at least as many times (as the number of required working days) he was not late to class?

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