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

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

b) For which 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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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

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