设随机变量X的分布律为P(X=1)=0.1,P(X=2)=0.3,P(X=4)=0.2,P(X=6)=0.4, 则P(Y=1)的值为https://img-ph-mirror.nosdn.127.net/cdNYlMNwkCfB-5D193JcFw==/6630701628327055565.png
举一反三
- 设随机变量X的分布律为P(X=1)=0.1,P(X=2)=0.3,P(X=4)=0.2,P(X=6)=0.4, 则P(Y=1)的值为
- 随机变量X的分布律为P(X=1)=0.1, P(X=2)=0.3, P(X=4)=0.2, P(X=6)=0.4, 设[img=102x27]18038eca776df2d.png[/img],则Y的数学期望为E(Y)=1×0.1+0×0.3+4×0.2+16×0.4=7.3 .
- 随机变量X的分布律为P(X=1)=0.1, P(X=2)=0.3, P(X=4)=0.2, P(X=6)=0.4, 设[img=102x27]1803e1901fd497a.png[/img],则Y的数学期望为E(Y)=1×0.1+0×0.3+4×0.2+16×0.4=7.3 .
- 随机变量X的分布律为P(X=1)=0.1, P(X=2)=0.3, P(X=4)=0.2, P(X=6)=0.4, 设[img=102x27]1803731a71b864b.png[/img],则Y的数学期望为E(Y)=1×0.1+0×0.3+4×0.2+16×0.4=7.3 .
- 设随机变量X的分布律为P(X=1)=0.1, P(X=2)=0.3, P(X=4)=0.2, P(X=6)=0.4, 已算得E(X)=3.9,则[img=490x27]1802d3f8f38b0bb.png[/img]