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確çãšããã®ã¯ãã®ããã«ãããç©äºãèµ·ããå²åããšããŠèãããã.
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šç¶, 1/2ãšéãã®ã§ã¯ãªããïŒãšæãããããç¥ããªã. ãããéèŠãªã®ã¯ã沢山ãç¹°ãè¿ããæã«ãšããããšã§ãã. ã³ã€ã³æãã10å,100åãšç¹°ãè¿ããšãéããªã1/2ã«è¿ã¥ãã®ã§ããã
確çã®å
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- Î©ãæšæ¬ç©ºé, Aãäºè±¡ãšãã.
- P(x) ã¯, äºè±¡ x ãç¬ç«å€æ°ãšã, 宿°å€ãåã颿°ãšãã.
- A1, A2, âŠã¯äºè±¡ã®åãšãã.
確çã®å

次ã®3ã€ã®åŒã®äºã確çã®å
¬çãšãã.
- P1 : ä»»æã®äºè±¡Aã«å¯Ÿã 0 †P(A) †1
- P2 : P(Ω)=1
- P3 : A1, A2, ⊠ãäºãã«èåäºè±¡ã§ãããšã ( Ï-å æ³æ§)
ãããã®æ§è³ªãæã€ P(x) ã®äºã確çïŒç¢ºç枬床ïŒãšãã. æåã«ã€ããŠã P1 , P2 , P3 ã¯, ãããã説æããããã®äŸ¿å®äžã®çªå·ã§ãã.
P1 ã®åŒã¯, 確ç㯠0 ãã 1 ãŸã§ã®å€ãåããšããæå³ã§ãã. 説æãããšãã確çãšããã®ã¯, å®éšåæ°ã«å¯ŸããŠãã®äºè±¡ãèµ·ããŠãããå²åãã§ãã. äžã®äžã«ã¯ãåæ Œç¢ºç 120 ïŒ
ãã®ãããªå€ãªèšèãããã, åããããªå®åã®äººã 100 人éãŸã£ãŠå
¥åŠè©Šéšãªã©ãåéšã㊠120 äººåæ Œãããªã©ãšããå€ãªããšã¯ãªã. 100 人ããåéšããŠããªãã®ãªã, åæ Œãã人æ°ã®æå€§å€ã 100 人ã§ãã, å²åã®æå€§å€ã 1 ã§ãã.
P2 ã®åŒãèŠãŠãã ãã. æšæ¬ç©ºé Ω ã¯èµ·ããåŸãå
šãŠã®çµæã®éåãªã®ã§, å®éšãäœåºŠç¹°ãè¿ããŠã, Ω ã«å«ãŸããæšæ¬ç¹ã®ãã¡ã®ã©ãã 1 ã€ããå¿
ããèµ·ããŠãã. ãããã£ãŠ, æšæ¬ç©ºéãšããäºè±¡ãèµ·ãã確ç㯠1 ãšãªã.
P3 ã®åŒãäžçªåããã«ãããããããªã. ã Ï -å æ³æ§ïŒãããŸãã»ãããïŒããšããé£ããååãã€ããŠãã.
- ç·åèšå·ãåããã«ãããšæã人ã¯
- P(A1 ⪠A2 ⪠⊠)=P(A1)+P(A2)+âŠ
- ãšããåŒã ãšæããšãã.
èåäºè±¡ãšã¯äœã ã£ããæãåºããš, Aj â© Ak = Ï ã®æ, å³ã¡, Ajãš Akã«éãªããç¡ããšã, ãã® Ajãš Akã¯èåäºè±¡ã«ãªã. äºãã«èåãšã¯ã©ãããæå³ãªã®ããšããã°, j â k ã®æ Ajãš Akãèåäºè±¡, å³ã¡, ã©ã® 2 ã€ã®äºè±¡ãåã£ããšããŠã, äºãã«éãªããªããšããæå³ã§ãã.
巊蟺ã«ããã¯Akã«éãªããç¡ãã®ã§, ããããã®Akã«å«ãŸããæšæ¬ç¹ã¯, ãã®åéåãåããšããæäœã§éãªãç¡ãè¶³ãã, ãšããäžã€ã®éåã«ãªã. å³èŸºã¯, åAkã«äžãããã確çP(Ak)ããã®ãŸãŸè¶³ããªãããšããæå³ã§ãã. éãªããç¡ãããããè¶³ããã®ã§ãã. éãªãããããšç°¡åã«ã¯è¶³ããªã.
- èåäºè±¡ã§ç¡ãå Žåã®ç¢ºçã®åã®åãæ¹ã¯, ãŸãåŸã»ã©èª¬æãã.
確çã®å¿çš
ãã£ã3ã€ã®ç¢ºçã®å
¬çãããããããªäºãåãã.
空äºè±¡ã®ç¢ºç
ãŸã A1 = Ω ãšãšã, k ⥠2 ã®ãšã㯠Ak = Ï ãšãã. ãã®æ, P3 ã®åŒã¯
- P(Ω)=P(Ω)+P(Ï)+P(Ï) âŠ
ã ãã, P1 , P2 ã®æ¡ä»¶ãã, P(Ï )=0 ãšããã.
- P3 ã®æ¡ä»¶ã«ã€ããŠå°ãè£è¶³ãã. ä»»æã®äºè±¡xã«å¯Ÿã㊠x â© Ï = Ï ã§ãã. ã€ãŸã, 空äºè±¡ãšä»ã®äºè±¡ã®å
±ééšåïŒç©äºè±¡ïŒã¯, 空äºè±¡ã§ãã. 空äºè±¡å士ã®å
±ééšåã空äºè±¡ã§ãã. ããã¯, 空äºè±¡ãšä»»æã®äºè±¡xã¯èåäºè±¡ã§ããããšã瀺ããŠãã. ãããã£ãŠ, P3 ã®æ¡ä»¶ãæºãã, P3 ã®åŒã䜿ãããšããããšã«ãªã.
æéå æ³æ§
ãŸãã¯, P(Ï )=0 ãšããåŒãåŸããã. ãããã, P3 ã®åŒã«ã€ããŠããå°ãæ¡ä»¶ãå³ããã㊠k > n ã®ãšã㯠Ak = Ï ãšãããš, P3 ã¯æ¬¡ã®ããã«æžãæãããã.
- P4 : A1, A2, ⊠, An ãäºãã«èåäºè±¡ã§ãããšã ïŒæéå æ³æ§ïŒ
k > n ã®ãšãã¯, P(Ak )= P(Ï) =0 ã§ããããšã䜿ã£ã. ãªãã ãåããã©ãããšãããŠããšæããããããããªãã, æ°åŠã§ã¯æåã«æ±ºããŠããçŽæäºã¯å°ãªãæ¹ããã, ãã®å°ãªãçŽæäºããããã«å€ãã®äºå®ãå°ãåºãããïŒãšããããšãæ°åŠã®é¢çœãã§ããã.
å·®äºè±¡ãšè£äºè±¡
å·®äºè±¡ A - B ã«ã€ã㊠(A - B) ⪠(A â© B) = A ã〠(A - B) â© (A â© B) = Ï ãªã®ã§
- P(A)=P(A - B)+P(A â© B)
- P(A - B)=P(A)-P(A â© B)
ãšãªã.
ããã§, A â B ã§ããã° A â© B=B ãªã®ã§
- P(A)=P(A - B)+P(B) ⥠P(B)
ãšãªã.
ãŸã, A = Ω ã§ããã°, å·®äºè±¡ Ω - B ã¯, äºè±¡Bã®è£äºè±¡ Bc ã®äºãªã®ã§
- P(Bc)=P(Ω)-P(B) = 1-P(B)
ãšãªã. ãããŸã§æ¥ãŠ, åã®è¯ãæ¹ã¯æ°ä»ãããç¥ããªãã
- P(Bc)= 1-P(B) ⥠0
ãã
- P(B) †1
ã§ãã. ãã®äžçåŒãå°ããŸã§, P1 ã®äžçåŒ 0 †P(A) †1 ã¯, å·ŠåŽã®äžçå·ãã䜿ã£ãŠãªãããšã«æ³šç®ãããš, P1 ã®å³åŽã®äžçå·ã¯äœåãšããããšã§, P1 ã¯æ¬¡ã®ããã«ãæžãæãããã.
- P1â²: ä»»æã®äºè±¡Aã«å¯Ÿã P(A) ⥠0
åäºè±¡
A ⪠B = (A - B) ⪠B ã〠(A - B) â© B = Ï ã§ãããåäºè±¡ A ⪠B ã«ã€ããŠ
- P(A ⪠B) = P(A - B)+P(B) = P(A)+P(B)-P(A ⩠B)
ãšãªã. ãã®åŒã¯å æ³å®çãšãåŒã°ãã.
- ç¹ã«AãšBãèåäºè±¡ã§ãããšãã«P(Aâ©B)=P(Ï)=0 ãªã®ã§, ããã¯æéå æ³æ§ P4 ã®åŒã«ãªã.
æ¡ä»¶ä»ã確ç
å®çŸ©
P(A)>0 ã®ãšã
ãæ¡ä»¶ä»ã確çãšãã.
P(B|A)ã¯, å
šäºè±¡ãΩ ããAã«åãæ¿ãããšãã®äºè±¡Bã®èµ·ãã確çãšèããããšãã§ãã. å³ã¡, P(B|A)ã¯äºè±¡Aãå¿
ãèµ·ãããšããæ¡ä»¶ã®å
ã§ã®äºè±¡Bã®èµ·ãã確çã§ãã.
ãã®ãšã, Aã¯å
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- = P(Ac)P(B)
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å
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