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7. There is a bus which has 40 seats go to school from departure station every...

7. There is a bus which has 40 seats go to school from departure station every Monday morning about 8:00 am. The average number of passengers that ride this bus at the same time is 35.

(a). What probability distribution is most appropriate for calculating the probability of a given number of passengers that ride this bus at this time?

(b). What is the probability that there is exactly no seat on the bus?

(c). What is the probability that there is 10, 20 or 30 passengers on the bus?

Math   Statistics-And-Probability   
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