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单选题 设随机变量X 的概率分布为 ,则a =( )

A. 0.6

B. 0.5

C. 0.4

D. 0.3

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时间：2025-12-26 00:08:43

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题目1
单选题
News report 1<iframe src="/module/audioplay.html?objectid=27ce54cb25771dce426507497ba98984"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:1
A. The international ivory sales.B. The domestic ivory trade.C. The slaughter of elephants.D. Both a and b.
题目2
单选题
News report 1<iframe src="/module/audioplay.html?objectid=27ce54cb25771dce426507497ba98984"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:2
A. On 31 December 2015.B. On 31 December 2017.C. In 2015.D. In 2017.
题目3
单选题
News report 1<iframe src="/module/audioplay.html?objectid=27ce54cb25771dce426507497ba98984"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:3
A. Conservationists applauded the move.B. The price of ivory in China began to fall.C. Ivory seizures fell dramatically.D. Both b and c.
题目4
单选题
News report 2<iframe src="/module/audioplay.html?objectid=f9b4ebb2d0dbb3302c53e2eb49d504d6"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:1
A. A competition.B. A solution.C. A device.D. An organization.
题目5
单选题
News report 2<iframe src="/module/audioplay.html?objectid=f9b4ebb2d0dbb3302c53e2eb49d504d6"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:2
A. Six.B. Four.C. Sixteen.D. Fourteen.
题目6
单选题
News report 2<iframe src="/module/audioplay.html?objectid=f9b4ebb2d0dbb3302c53e2eb49d504d6"></iframe>Read the choices. Then listen to the news report and choose the best answer to each question you hear小题:3
A. On Tuesday.B. On Thursday.C. On Saturday.D. Not mentioned.
题目7
单选题
设随机变量X 的概率分布为<img src="https://tihai-oss-cloud.itihey.com/img/faf7ddcf0bb90a870128831dcad1b128.jpg"> ,则a =( )
A. 0.6B. 0.5C. 0.4D. 0.3
题目8
单选题
<img src="https://tihai-oss-cloud.itihey.com/img/6f620f0ea53d599aa177d67a3fe2c0e4.png">
A. <img src="https://tihai-oss-cloud.itihey.com/img/a57995c998e26100911011315bd70dcc.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/904fb44bb430b767c743a7432b11d5a6.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/526c2c58cfcd28eb545e465489068622.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/eaee2ea299123225b955b0ee06388eeb.png">
题目9
单选题
已知随机变量X只能取-1, 0, 1, 2四个数值, 其相应的概率依次为 <img src="https://tihai-oss-cloud.itihey.com/img/99d581e4c74d298689c92662571a4404.png">, <img src="https://tihai-oss-cloud.itihey.com/img/ea2768b0f501b692345ffe12cd50368f.png">, <img src="https://tihai-oss-cloud.itihey.com/img/94d5bfc5f210482f9feb0cbf7584af10.png">, <img src="https://tihai-oss-cloud.itihey.com/img/d9489d6f2ba9b3a0c6eb9ea36cf7fb85.png">,则c = ( )
A. 3B. 2C. 9D. 6
题目10
单选题
事件 <img src="https://tihai-oss-cloud.itihey.com/img/56bf6d9e37683a2b8db4265dd752c241.png">发生的概率为 <img src="https://tihai-oss-cloud.itihey.com/img/d56896ed8af28a09c159feaf1febd162.png">,现重复进行n次独立试验,则事件 <img src="https://tihai-oss-cloud.itihey.com/img/56bf6d9e37683a2b8db4265dd752c241.png">至多发生一次的概率为( )
A. <img src="https://tihai-oss-cloud.itihey.com/img/ed1faf7641de7d6c5af65edef2bf9300.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ef30f3e8418e52f7ed121d2e8beb1b00.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/4535c95bfaf5805125c7f59d1e02ff1b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/7c4d9147adcebcec1222578231986f58.png">
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