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Q1.(15) At one call center, assume the probability of receiving one phone call in a given...

Q1.(15) At one call center, assume the probability of receiving one phone call in a given time period is the same, and the numbers of phone calls in one time period is independent from others. It is known that the average number of phone calls in any one hour is 10. One hour period is randomly selected.
1.(5) Find the probability that exactly 11 phone calls will be received.
2.(5) Find the probability that at most 8 phone calls will be received.
3.(5) Find the probability that the number of phone calls will be greater than the mean number of phone calls (in one hour).

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