NO.PZ2023091601000030
问题如下：
A call center receives an
average of two phone calls per hour. The probability that they will receive 20
calls in an 8-hour day is closest to:
选项：
A.5.59%
B.16.56%
C.3.66%
D.6.40%
解释：
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 Poisson distribution, we solve for
the probability that X will be 20.
P(X = 20) = 0.0559
= 5.59%
首先：按16 → +- → 2ND → LN，这个是计算exp(-λ)；
我也是这样按的 ，按了LN后就是0
