【单选题】【消耗次数：1】
一个射手每次射击的命中率为0.5.连续射击10次，命中5次的概率为
①
0.2461
②
0.3526
③
0.681
④
0.4.71
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相关题目
【单选题】
一射手对目标连续射击直到击中目标为止，设射击次数为X，则X是
①
连续性随机变量
②
离散型随机变量
③
既是离散型随机变量也是连续性随机变量
④
既不是离散型随机变量也不是连续性随机变量
【单选题】
射击3次，事件Ak表示第k次命中目标（k=1,2,3），则下列不能表示事件“至少命中一次”的是
①
A1<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/21C1A309F79FCCD26A5849765A807D9D.png style=font-family: Arial, sans-serif; font-size: 12px; white-space: normal; vertical-align: middle;/>A2<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/21C1A309F79FCCD26A5849765A807D9D.png style=vertical-align: middle;/>A3
②
A1<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/21C1A309F79FCCD26A5849765A807D9D.png style=font-family: Arial, sans-serif; font-size: 12px; white-space: normal; vertical-align: middle;/>(A2-A1)<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/21C1A309F79FCCD26A5849765A807D9D.png style=font-family: Arial, sans-serif; font-size: 12px; white-space: normal; vertical-align: middle;/>(A3-A2-A2)
③
<img class=jc-formula data-tex=\Omega -\bar { { A }_{ 1 } } \bar { { A }_{ 2 } } \bar { { A }_{ 3 } } src=https://huaweicloudobs.ahjxjy.cn/37955615CF87A371ABBDC96AAD211F3C.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex={ A }_{ 1 }\bar { { A }_{ 2 } } \bar { { A }_{ 3 } } \cup { A }_{ 2 }\bar { { A }_{ 1 } } \bar { { A }_{ 3 } } \cup { A }_{ 3 }\bar { { A }_{ 2 } } \bar { { A }_{ 1 } } src=https://huaweicloudobs.ahjxjy.cn/42F1E894D8CC50CC1260B973299EFDF6.png style=vertical-align: middle;/>
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