(B)
?1?k?1. p{X?kX?Y?n}?Cn???????2??1?2y7?,0?y?12. f(yx)??1?x4,.
15?其它?0,3. 37件.
k??2????????2??1n?k,k?0,1,?,n.
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3?其它?0,5.
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?0,其它?z?0z?0?0,?0,???z?z(2)FZ(z)??z?e?1,0?z?1,fZ(z)??1?e,0?z?1.
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2?z22.
1;(2)他有区分的能力. 702k?1218389.(1)p{X?k}?()(1?),k?1,2,?;(2)p{Y?i}?,i?1,2,3;(3),.
33327818.(1)
习题三 (A)
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8844116. 2,. 7. . 8. 0 9.?,0,.
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43116,,,. 22. 10,0 . 55215(B)
1. 10分25秒. 2. 0.6,0.46 . 3. (1)-0.15,-0.36;(2)??0.15??0.9. ???0.150.25?1m?4n?1n2?19?4. n?1?(1?)?. 5. n,,. n. 6.
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12348,2,,;(2),0.574. 11. 不相关,不独立. 749563习题四 (A)
1.. 2.
1981. 3.0.975 . 4.. 9125. 0.997 . 6.(1)0.0174;(2)0.2545. 7. 0.323 . 8. 12655片.
9.104 . 10. 0.1802 . 11. (1) 0.1587;(2)1809900. 12.0.9164. 13.142. 14. 0.2119. 15. (1)0.087;(2)0.912 16. 16次. 17.0.9525 .
(B)
1. 0.4714.