【单选题】
一袋中有两个黑球和若干个白球,现有放回地摸球4次,若至少摸到一个白球的概率为80/81,则袋中白球数是( ).
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/A44E6591DB5759597A3625C68BFC9045.png title=题干.png alt=题干.png width=713 height=55 style=width: 713px; height: 55px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/836FCD7D779D52E6AEE1C9FAD4C4F5C3.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/40CCDBC0D0F6BBD1E76D50FB4337E4CA.png title=2.png alt=2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/33BFABB69EF83EE33F18E976C9336C77.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/A107EE5B80A352F8DEF4E588EACD0579.png title=4.png style=white-space: normal;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/EE3CDF59B0561DC9BCF7E669945AA3FD.png title=题干.png alt=题干.png width=740 height=81 style=width: 740px; height: 81px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/93B9D31CA7A6DFD89850160BAC111042.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/480853E08D6DE588655AE8E7AE3C2487.png title=2.png style=white-space: normal;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/1786EC2A1323301899C1FA9F672C0A20.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/4D9D5C239ADA48D18DDBC78A210B0CCF.png title=4.png style=white-space: normal;/>
【单选题】
某种产品表面上的疵点数服从泊松分布,平均每件上有1个疵点,若规定疵点数不超过1的为一等品,价值10元;疵点数大于1不多于3的为二等品,价值8元;3个以上者为废品,则产品的废品率为
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/CD06610B35948D1DE51C5BF3A8EC36BE.png title=题干.png alt=题干.png width=778 height=76 style=width: 778px; height: 76px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/061705AE237CFDFFB69B6866FF40278C.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/392CD3024B6445EB60EFA0BAA54311CD.png title=3.png style=white-space: normal; width: 735px; height: 86px; width=735 height=86/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/1734F9887CF8B20581EDC18E4732E631.png title=2.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/2DFA2E7A019D116E0DDDB3D63A90D1B9.png title=4.png style=white-space: normal; width: 752px; height: 110px; width=752 height=110/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/4763991A5FEB36C30F2D15F1459AAB51.png title=题干.png alt=题干.png width=861 height=114 style=width: 861px; height: 114px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/553893536C82E40DB761A7EC2161D45E.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/11A6CA965CD07046649EDDD564936419.png title=2.png style=white-space: normal;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/B83D282BA6B9F81623D41FBB9CE648BB.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/784505A81EE65223625BEFFA092FB96D.png title=4.png style=white-space: normal;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/D2821A9203B1245B21C7DAD128DD9F65.png title=题干.png alt=题干.png width=762 height=90 style=width: 762px; height: 90px;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/B7319F3A2E4D8147392704EDBDF5276F.png title=题干.png alt=题干.png width=825 height=47 style=width: 825px; height: 47px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/C11832AB0459C6359BE89FC090E4981E.png style=width: 195px; height: 47px; title=2.png width=195 height=47/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/B7C148A344072B4A45D3F2352B2C8E8E.png title=1.png style=white-space: normal; width: 100px; height: 39px; width=100 height=39/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/F00599135518EF9BDA37FFBD82725667.png title=3.png style=white-space: normal; width: 199px; height: 51px; width=199 height=51/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/41C4696FDAC2A6470FF8CB3A1D4A94D6.png title=4.png style=white-space: normal; width: 149px; height: 49px; width=149 height=49/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/2B8F5B37567233E3945BBCE9B555C0DC.png title=题干.png alt=题干.png width=778 height=64 style=width: 778px; height: 64px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/EFC675AE3744A9AF93F09018BCB4A2E7.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/E4B5592E21E079EB5C40749489FEB427.png title=2.png style=white-space: normal;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/5FB3C875071AE4B9B2646BAE5AEBD870.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/A2FD86B4633AC9A2BB900CEB3192861C.png title=4.png style=white-space: normal;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/993CD1D23E1CAC3999CF9170310D5A62.png title=题干.png alt=题干.png width=833 height=82 style=width: 833px; height: 82px;/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/6439788EF1744D5A048267BE5E3D02AC.png style= title=1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/2D1FB5ED18FB726B5C7C0C7151103B4B.png title=2.png style=white-space: normal;/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/B9AD33650D0BEEDC14E936D562A08495.png title=3.png style=white-space: normal;/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/D4F366EF697EED6DBD892B43241B36C2.png title=4.png style=white-space: normal;/>