Читать книгу Reliability Analysis, Safety Assessment and Optimization - Enrico Zio - Страница 24

Poisson distribution is widely used in quality and reliability engineering. A random variable X has the Poisson distribution with parameter λ, λ>0, the pmf (shown in Figure 1.2) of X is as follows:

(1.17)

Figure 1.2 The pmf of the Poisson distribution with λ=0.6_.

The mean and variance of the Poisson distribution are

((1.18)