When can you use the normal distribution to approximate the Poisson distribution,
assuming you have n independent trials each with a probability of
success of p
A. When the mean of the Poisson distribution is very small
B. When the variance of the Poisson distribution is very small
C. When the number of observations is very large and the success rate is
close to 1
D. When the number of observations is very large and the success rate is
close to 0

书上的答案是c。但是我理解的是np=λ，当n很大的时候，p应该趋于零，应该选D吧？