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学科：默认课程

时间：2025-12-12 15:57:27

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<img src="https://p.ananas.chaoxing.com/star3/origin/71ab15ace268da8dc6df70401118dbc5.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/270218c016b93e3fc053859cbcf7d1d9.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/9eea07cad66b86442332d9fd50e498cb.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/20dc80247cd50c5318924400d1855b9b.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/a281aef2d01670223399b6f88c46636a.png">

设X和Y相互独立,且X~N(2,3),Y~N(1,2),则X-Y~

A. <img src="http://p.ananas.chaoxing.com/star3/origin/416a9528db105daafca854a71043623e.png">B. <img src="http://p.ananas.chaoxing.com/star3/origin/744e4a68ab7cf5a078d0fcd659aef2a9.png">C. <img src="http://p.ananas.chaoxing.com/star3/origin/1637e9c055a443e0c9637ed2f1a258f7.png">D. <img src="http://p.ananas.chaoxing.com/star3/origin/05389060403eada0a81b88655a2f5629.png">

<img src="http://p.ananas.chaoxing.com/star3/origin/19635afbe69b6dd9f58e63d1df5228ee.png">

A. <img src="http://p.ananas.chaoxing.com/star3/origin/7d5a6924a4e38afde2ccb84f1d2be342.png">B. <img src="http://p.ananas.chaoxing.com/star3/origin/96c5cb4cf8bf8f414ab7e97fa6b30e52.png">C. <img src="http://p.ananas.chaoxing.com/star3/origin/064c13f5c3456c0a68204c9aedb380f0.png">D. 都不是

<img src="https://p.ananas.chaoxing.com/star3/origin/1815939e59be6ea85c0139e9c85f39a4.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/0a9207ee0a02d76e0fa73dc3a8d949b2.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/1254f3aaa1dca24a39a230116b725f3e.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/65357ba74e6d740e68cf1356228c1c2e.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/1fc5d5c12823ac679081f6210e8a4895.png">

<img src="https://p.ananas.chaoxing.com/star3/origin/aad7984a50e6e1f49a0f75b6a4060a45.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/037b9e7a8dbd71897fadbedae1a54aed.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/f49ade48ff219546104dfb5e3bb66473.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/c481a14a094e69d46d136be541d2e6b0.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/e4cef4f6864c794674f4032c7af9ed22.png">

设X,Y相互独立且X~N(<img src="/ananas/latex/p/1693">,<img src="/ananas/latex/p/6467">),Y~N(,<img src="/ananas/latex/p/1694">,<img src="/ananas/latex/p/6469">),则Z=X-Y仍服从正态分布,且有Z~(<img src="/ananas/latex/p/200">,<img src="/ananas/latex/p/3922">),其中,<img src="https://mooc1.chaoxing.com/ananas/latex/p/200">,<img src="https://mooc1.chaoxing.com/ananas/latex/p/3922">等于()

A. <img src="/ananas/latex/p/3672044">B. <img src="/ananas/latex/p/3672041">C. <img src="/ananas/latex/p/3672045">D. <img src="/ananas/latex/p/3672047">

<img src="http://p.ananas.chaoxing.com/star3/origin/0e821331879ae360ec81aedd45a3e23f.png">

A. <img src="http://p.ananas.chaoxing.com/star3/origin/9f95b69561eb6e4eeafa67e283789f86.png">B. <img src="http://p.ananas.chaoxing.com/star3/origin/c2cbc751e464fa22bd0a3ff591f590a1.png">C. <img src="http://p.ananas.chaoxing.com/star3/origin/3c12ed6d46ab820379ce82b95eca72d6.png">D. <img src="http://p.ananas.chaoxing.com/star3/origin/433474461f7afc6d85e9e037af1e1469.png">

<img src="http://p.ananas.chaoxing.com/star3/origin/73d8f00ce01b565f2d162304057d3f02.png"> (答案请用小数表示并保留二位小数)

设随机变量X与Y相互独立,已知(X,Y)的概率密度为f(x,y),则随机变量 (-X,-Y)的概率密度为 .(答案请在英文状态下输入)

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