设随机变量 服从二项分布 ，且 则n,p的值分别为 A． B． C． D 已知随机变量ξ服从二项分布，且Eξ=2.4，Dξ=1.44，...
\u5df2\u77e5\u79bb\u6563\u578b\u968f\u673a\u53d8\u91cfX\u670d\u4ece\u4e8c\u9879\u5206\u5e03X\uff5eB\uff08n\uff0cp\uff09\u4e14E\uff08X\uff09=3\uff0cD\uff08X\uff09=2\uff0c\u5219n\u4e0ep\u7684\u503c\u5206\u522b\u4e3a\uff08\u3000\u3000\uff09 A\uff0e 9\u2235\u968f\u673a\u53d8\u91cfX\u670d\u4ece\u4e8c\u9879\u5206\u5e03X\uff5eB\uff08n\uff0cp\uff09\uff0c\u4e14E\uff08X\uff09=3\uff0cD\uff08X\uff09=2\uff0c\u2234E\uff08X\uff09=3=np\uff0c\u2460D\uff08X\uff09=2=np\uff081-p\uff09\uff0c\u2461\u2460\u4e0e\u2461\u76f8\u9664\u53ef\u5f971-p= 2 3 \uff0c\u2234p= 1 3 \uff0cn=9\uff0e\u6545\u9009B\uff0e
\u2235\u03be\u670d\u4ece\u4e8c\u9879\u5206\u5e03B\uff5e\uff08n\uff0cp\uff09\u7531E\u03be=2.4=np\uff0cD\u03be=1.44=np\uff081-p\uff09\uff0c\u53ef\u5f97p=0.4\uff0cn=6\uff0e\u6545\u9009\uff1aC\uff0e
| D 扩展阅读：设随机变量x在区间 0 2 ... 设随机变量x n 0 1 ... 随机变量x~n(1 ... 设x服从泊松分布 ... 4) ... 设随机变量x b ... 随机变量x b 2 p ... 三个重要分布 ... 设随机变量x服从正态分布n ... 本站交流只代表网友个人观点，与本站立场无关 |
