事件发生的概率P=0.01,实验次数N=50,
买房人数为随机变量X,
如果认为X二项分布B(50,0.01)则(用计算器)
P(X=0)=0.6050,P(X=1)=0.306,
(1),0.306 (2)1-0.605=0.395(3)1-0.605-0.306=0.089,
如果认为X近似服从入=1/2的泊松分布则(查表:)
P(X=0)=0.6065,P(X=1)=0.3033,
(1),0.3033 (2)1-0.6065=0.3935(3)1-0.6065-0.3033=0.0902,