Dab tsi yog qhov xwm txheej ywj pheej hauv qhov tshwm sim?
Dab tsi yog qhov xwm txheej ywj pheej hauv qhov tshwm sim?

Video: Dab tsi yog qhov xwm txheej ywj pheej hauv qhov tshwm sim?

Video: Dab tsi yog qhov xwm txheej ywj pheej hauv qhov tshwm sim?
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Cov xwm txheej ywj pheej . Thaum ob xwm txheej hais tias yog ywj siab ntawm ib leeg, qhov no txhais tau tias yog qhov qhov tshwm sim tus ntawd xwm txheej tshwm sim nyob rau hauv tsis muaj txoj kev cuam tshuam rau qhov tshwm sim ntawm lwm tus xwm txheej tshwm sim. Ib qho piv txwv ntawm ob cov xwm txheej ywj pheej yog raws li nram no; hais tias koj dov ib tug tuag thiab flipped ib npib.

Raws li qhov tshwm sim, qhov piv txwv ntawm qhov kev tshwm sim ywj pheej yog dab tsi?

Txhais: Ob xwm txheej , A thiab B, yog ywj siab yog tias qhov tseeb tias A tshwm sim tsis cuam tshuam qhov tshwm sim ntawm B tshwm sim. Ib txhia piv txwv ntawm cov xwm txheej ywj pheej yog: tsaws saum taub hau tom qab pov ib npib THIAB dov ib 5 ntawm ib leeg 6-sab tuag. Xaiv ib lub marble los ntawm lub thawv thiab tsaws ntawm lub taub hau tom qab pov ib npib.

Ib yam li ntawd, dab tsi yog qhov kev vam thiab kev ywj pheej nyob rau hauv qhov tshwm sim? Peb hu xwm txheej nyob yog paub tias ib tug ntawm lawv tshwm sim qhia peb ib yam dab tsi txog seb lwm tus tshwm sim. Cov xwm txheej ywj pheej tsis pub peb paub txog ib leeg; tus qhov tshwm sim ntawm ib xwm txheej tshwm sim tsis cuam tshuam rau qhov tshwm sim ntawm lwm tus xwm txheej tshwm sim.

Ua li no, ua li cas koj thiaj paub tias qhov kev tshwm sim yog ywj siab lossis nyob ntawm?

Mus kuaj seb ob xwm txheej A thiab B yog ywj siab , suav P(A), P(B), thiab P(A ∩ B), thiab xyuas seb P(A ∩ B) sib npaug P(A) P(B). Yog lawv sib npaug, A thiab B yog ywj siab ; yog tsis yog, lawv yog nyob.

Qhov tshwm sim ntawm ob qhov xwm txheej ywj pheej yog dab tsi?

Qhov yuav tshwm sim ntawm ob qhov xwm txheej Qhov tshwm sim ua ke: Kev ywj pheej Cia li muab cov qhov tshwm sim ntawm thawj xwm txheej los ntawm qhov thib ob. Piv txwv li, yog tias cov qhov tshwm sim ntawm xwm txheej A yog 2/9 thiab qhov tshwm sim ntawm xwm txheej B yog 3/9 ces tus qhov tshwm sim ntawm ob qho tib si xwm txheej luas = 2/9 x (3/9) = 6/81 = 2/27.

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