问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
请问一下老师，泊松分布里面，不是要求n足够大，p很小，而np为常数吗？这个题目究竟问的是啥东西？
NO.PZ2016062402000016 When cyou use the normstribution to approximate the Poisson stribution, assuming you have n inpennt trials, eawith a probability of success of p? When the meof the Poisson stribution is very small When the varianof the Poisson stribution is very small When the number of observations is very large anthe success rate is close to 1 When the number of observations is very large anthe success rate is close to 0 The normapproximation to the Poisson improves when the success rate, χ, is very high. Because this is also the meanvariance, answers A anare wrong. In turn, the binominsity is well approximatethe Poisson nsity when np = χ is large. 辅导员，这里也是没明白为啥要接近于1，数据的规模这个是没有问题
When cyou use the normstribution to approximate the Poisson stribution, assuming you have n inpennt trials, eawith a probability of success of p? When the meof the Poisson stribution is very small When the varianof the Poisson stribution is very small When the number of observations is very large anthe success rate is close to 1 When the number of observations is very large anthe success rate is close to 0 The normapproximation to the Poisson improves when the success rate, χ, is very high. Because this is also the meanvariance, answers A anare wrong. In turn, the binominsity is well approximatethe Poisson nsity when np = χ is large. 请问这个success rate为什么要接近1呢 不是np越大就可以越好的approximate么
When cyou use the normstribution to approximate the Poisson stribution, assuming you have n inpennt trials, eawith a probability of success of p? When the meof the Poisson stribution is very small When the varianof the Poisson stribution is very small When the number of observations is very large anthe success rate is close to 1 When the number of observations is very large anthe success rate is close to 0 The normapproximation to the Poisson improves when the success rate, χ, is very high. Because this is also the meanvariance, answers A anare wrong. In turn, the binominsity is well approximatethe Poisson nsity when np = χ is large. P->0, 为什么不选
When cyou use the normstribution to approximate the Poisson stribution, assuming you have n inpennt trials, eawith a probability of success of p? When the meof the Poisson stribution is very small When the varianof the Poisson stribution is very small When the number of observations is very large anthe success rate is close to 1 When the number of observations is very large anthe success rate is close to 0 The normapproximation to the Poisson improves when the success rate, χ, is very high. Because this is also the meanvariance, answers A anare wrong. In turn, the binominsity is well approximatethe Poisson nsity when np = χ is large. 为啥不选possion分布的适用条件不是概率很小，N很大吗？老师讲的
P不可能大，所以np很大的实质就是n很大对吧？
