Cov txheej txheem:
Video: Yuav ua li cas koj xam tej yam tshwm sim?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov mis rau xwm yeem tshwm sim yog muab los ntawm qhov tshwm sim txoj cai sib npaug, P(A thiab B) = P(A) * P(B|A). Koj tuaj yeem pom txoj cai no ua P(A∪B). Lub cim Union (∪) txhais tau tias "thiab", xws li nyob rau hauv qhov xwm txheej A tshwm sim thiab qhov tshwm sim B tshwm sim.
Nyob rau hauv no txoj kev, dab tsi yog lub formula rau conditional probability?
Yog tias A thiab B yog ob qhov xwm txheej hauv qhov chaw piv txwv S, ces qhov xwm yeem tshwm sim ntawm A muab B yog txhais tias P(A|B)=P(A∩B)P(B), thaum P(B)>0.
Ib yam li ntawd, qhov xwm txheej tshwm sim hauv lej yog dab tsi? A xwm yeem tshwm sim yog a qhov tshwm sim tias ib qho xwm txheej yuav tshwm sim muab qee qhov kev paub txog qhov tshwm sim lossis qee qhov xwm txheej. P (A ∣ B) P (Amid B) P (A∣B) yog a xwm yeem tshwm sim.
Ib sab saum toj no, koj ua li cas daws cov teeb meem tshwm sim?
Cov mis rau qhov xwm txheej yuav tshwm sim tuaj yeem muab tau los ntawm Txoj Cai Sib Tw 2 raws li hauv qab no:
- Pib nrog Txoj Cai Sib Tw 2.
- Faib ob sab ntawm kev sib npaug los ntawm P(A).
- Ncua tseg P(A) s ntawm sab xis ntawm kev sib npaug.
- Commute qhov sib npaug.
- Peb tau muab cov qauv rau kev ua tau zoo.
Yuav ua li cas piav qhia nrog ib qho piv txwv?
Qhov yuav tshwm sim . Qhov yuav tshwm sim yog qhov yuav tshwm sim uas yuav tshwm sim thiab suav los ntawm kev faib cov txiaj ntsig zoo los ntawm tag nrho cov txiaj ntsig tau tshwm sim. Qhov yooj yim tshaj plaws piv txwv yog npib npib. Muaj 50% txoj hauv kev uas qhov tshwm sim yuav yog taub hau, thiab muaj 50% txoj hauv kev uas qhov tshwm sim yuav yog tails.
Pom zoo:
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