Yuav ua li cas koj thiaj nrhiav tau qhov rov tshwm sim ntawm dej nyab?
Yuav ua li cas koj thiaj nrhiav tau qhov rov tshwm sim ntawm dej nyab?

Video: Yuav ua li cas koj thiaj nrhiav tau qhov rov tshwm sim ntawm dej nyab?

Video: Yuav ua li cas koj thiaj nrhiav tau qhov rov tshwm sim ntawm dej nyab?
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Piv txwv li, tsib dej nyab sau tseg hauv 100 xyoo. Siv tus qauv: Lub sijhawm rov tshwm sim sib npaug ntawm cov xyoo ntawm cov ntaub ntawv muab faib los ntawm cov xwm txheej. Txuas koj cov ntaub ntawv thiab suav cov rov tshwm sim . Hauv qhov piv txwv, 100 xyoo muab faib los ntawm tsib qhov tshwm sim ua ib qho rov tshwm sim ntawm 20 xyoo.

Kuj tseem paub yog, lub sijhawm rov tshwm sim ntawm dej nyab yog dab tsi?

Lub sijhawm rov qab los, tseem hu ua a rov tshwm sim los yog rov ua dua lub sijhawm , yog lub sijhawm nruab nrab lossis kwv yees nruab nrab ntawm cov xwm txheej xws li av qeeg, dej nyab , landslides, los yog ib tug dej paug ntws mus tshwm sim.

Tsis tas li ntawd, lub sijhawm rov ua dua ntawm cov lus nug dej nyab yog dab tsi? Dej nyab zaus / rov tshwm sim ntau npaum li cas, qhov nruab nrab a dej nyab ntawm qee qhov loj tuaj yeem xav tias yuav tshwm sim. 100 xyoo dej nyab yog a dej nyab nrog rau theem tso tawm uas tshwm sim kwv yees li ib zaug hauv 100 xyoo. Mathematically, nws yog a dej nyab nws qhov kev tso tawm muaj 1% qhov tshwm sim txhua xyoo.

Tsis tas li ntawd, lub sijhawm rov tshwm sim ntawm 100 xyoo dej nyab yog dab tsi?

Lub sij hawm " 100 - xyoo dej nyab " yog siv los piav txog qhov rov tshwm sim ntawm dej nyab . Cov 100 - xyoo rov tshwm sim txhais tias a dej nyab ntawm qhov loj no muaj ib feem pua ntawm qhov tshwm sim hauv ib qho twg xyoo . Hauv lwm lo lus, txoj hauv kev uas tus dej yuav ntws siab npaum li qhov 100 - xyoo dej nyab theem no xyoo yog 1in 100.

Yuav ua li cas yog tus qauv yooj yim rau xam qhov rov tshwm sim ncua sij hawm t rau ib tug tej yam me me dej nyab?

Tam sim no koj yuav tsum muaj ob daim duab; thawj, tus naj npawb ntawm xyoo cov ntaub ntawv keeb kwm npog, thiab thib ob, tus naj npawb ntawm cov dej dej nyab nyob rau lub sijhawm ntawd. Muab cov duab tso rau hauv kev sib npaug T = N/n. “ T ” sawv cev rau lub caij dej nyab ; "N" tus naj npawb ntawm xyoo nyob rau hauv cov ntaub ntawv keeb kwm thiab "n" tus naj npawb ntawm dej nyab.

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