《概率论与数理统计》2020年春学期在线作业（二）

adminhan

<p>题目及选项如下：</p><p><img height="140" width="482" alt="" src="http://file.open.com.cn/ItemDB/3348/a42a2023-0dc6-41c6-8956-b08206670a67/20093189236787.JPG" /></p>
A:A
B:B
C:C
D:D

<p>题目及选项如下：</p><p><img height="63" width="381" alt="" src="http://file.open.com.cn/ItemDB/3348/aea4514f-3683-4d00-8049-91f697b83569/200931891856884.JPG" /></p>
A:A
B:B
C:C
D:D

<p>X与Y独立且DX=16，DY=9,则D(X+Y)=（）。</p>
A:25
B:16
C:9
D:7

<p>题目如下：</p><p><img height="59" width="472" alt="" src="http://file.open.com.cn/ItemDB/3348/1a20a59d-cb05-4017-82cb-4830fb48db5f/200931893552543.JPG" /></p>
A:3
B:1/3
C:2
D:1/2

一批产品共有<span>10个正品2个次品，从中任取两个，则两个都是次品的概率为(&nbsp;)。</span>
A:1/45
B:1/50
C:1/66
D:1/72

<p>题目及选项如下：</p><p><img height="109" width="610" alt="" src="http://file.open.com.cn/ItemDB/3348/b0c3e7cd-f11c-492d-8331-560dd9b8e5d7/200931891151968.JPG" /></p>
A:A
B:B
C:C
D:D

<p>题目及选项如下：</p><p><img height="114" width="597" alt="" src="http://file.open.com.cn/ItemDB/3348/b9dc8492-a9c0-4175-bdcb-fa5bee86493c/2009318101415388.JPG" /></p>
A:A
B:B
C:C
D:D

<p>题目及选项如下：</p><p><img height="160" width="470" alt="" src="http://file.open.com.cn/ItemDB/3348/fb45cc71-0fb7-42d6-99db-4284672098b6/200931810659488.JPG" /></p>
A:A
B:B
C:C
D:D

<p>题目如下：</p><p><img height="35" width="438" alt="" src="http://file.open.com.cn/ItemDB/3348/c90f4ed4-6261-46d8-9033-5b142c292889/20093181082534.JPG" /></p>
A:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">保持不变</span>
B:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单调减少</span>
C:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">单调增加</span>
D:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">增减不定</span>

<p>题目及选项如下：</p><p><img height="67" width="417" alt="" src="http://file.open.com.cn/ItemDB/3348/939f66a2-5659-46fc-aeb8-d5ab611aa117/200931895428294.JPG" /></p>
A:A
B:B
C:C
D:D