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【单选题】
某商店根据过去的销售记录知道某种商品每月的销售量可以用 的泊松分布来描述. 本月进货12件,则本月销售会脱销的概率,用SAS命令计算语句正确的是:【 】(假设每月只进货一次).A.
1-poisson(10,12);
B.
1- poisson(12,10);
C.
poisson(10,12);
D.
poisson(12,10);
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