还是概率,数学英文都好的进acalculatormanufacturerchecksfordefectiveproductsbytesting3calculatorsoutofeverylotof12.ifadefectivecalculatorisfound,thelotisrejected.a.suppose2calculatorsinalotaredefective.calcula

　　还是概率,数学英文都好的进

　　acalculatormanufacturerchecksfordefectiveproductsbytesting3calculatorsoutofeverylotof12.ifadefectivecalculatorisfound,thelotisrejected.

　　a.suppose2calculatorsinalotaredefective.calculatetheprobabilitythatthelotwillberejected

　　b.thequality-controldepartmentwantstohaveatleasta30%chanceofrejectinglotsthatcontainonlyonedefectivecalculator.iscalculatorsinalotof12sufficient?ifnotwhyandhowtopromote.supposeanswerwithmathematicalcalculations

　　第一问我就用,1减去（2选0）乘（10选3）除与（12选3）

　　第2问.我不太明白究竟要怎么做.达人们给点提示,思路是什么样的

　　第一问是没什么问题了。

　　第二问。你的思路是什么样的呢。给说说吧