There are 2 phone calls per hour in a ca...

题目

There are 2 phone calls per hour in a call center every day. The probability that they will receive 20 calls in an 8-hour day is closest to:

选项

A.5.59%

B.6.56%

C.7.66%

D.8.40%

答案

A

解析

To solve this question, we first need to realize that the expected number of phone calls in an 8-hour day is λ = 2 × 8 = 16. Using the Poissondistribution, we solve for the probability that X will be 20.P(X= 20) = 0.0559 = 5.59% 要解决此问题，我们首先需要意识到，一天8小时内的预期电话呼叫次数为λ= 2×8 =16。使用泊松分布，我们解决了X为20.P（ X = 20）= 0.0559 = 5.59％