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Mathematics 13 Online
OpenStudy (anonymous):

#5 35% of all pets sold at a pet store are dogs. One day, 8 people arrive at the store and purchase pets. (Note: One pet is purchased per person.) (a) What is the probability that exactly 4 of them are dogs? (b) If the store has only 4 dogs, what is the probability that they have sufficient dogs for sale that day?

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