Tus nqi nruab nrab qhov zaus txuas ntxiv tuaj yeem pom los ntawm kev siv qhov nruab nrab ntawm qis thiab qis qis
- Mid nqi=
- Piv txwv 1: Chav kawm ncua ntawm 40≤x<45,. Qhov nruab nrab yog 42.5.
- Piv txwv 2: Chav kawm ncua ntawm 1.1≤x≤1.5,. Qhov nruab nrab yog 1.25.
- Piv txwv 3: Chav kawm ncua ntawm x<50… x<60.. …
- Example 4: Chav kawm ncua ntawm 20 < x < 30.
Koj pom qhov nruab nrab ntawm qhov txuas ntxiv li cas?
Nws yog ib txoj hauv kev yooj yim, koj pom qhov nruab nrab ntawm lub ntsiab lus ntawm X, muab lawv nrog F, tom qab ntawd ntxiv lawv mus nrhiav kev suav fm, qhov m yog hais txog nruab nrab- taw tes los ntawm X, thaum kawg, cov lej tau muab faib los ntawm kev suav sau F. Cov kauj ruam koom nrog: Nrhiav cov ntsiab lus nruab nrab ntawm chav kawm ntu (X) muab rau hauv nqe lus nug.
Yuav ua li cas xam tus nqi nruab nrab yog dab tsi?
Qhov nruab nrab yog hom nruab nrab, lossis txhais tau tias. Cov khoom siv hluav taws xob hauv hluav taws xob qee zaum raug faib ua "midrange", txhais tau tias lawv nyob hauv tus nqi nruab nrab. Cov mis mus nrhiav qhov nruab nrab =(siab + qis) / 2.
Yuav ua li cas yog tus qauv los xam qhov nruab nrab hauv cov koob txuas ntxiv?
Cf yog qhov ntau zaus, f qhov zaus ntawm lub sijhawm ntawd thiab kuv yog qhov ntev ntawm chav kawm. Qhov nruab nrab kuj tuaj yeem xam los ntawm cov qauv hauv qab no: M=L – Cf-N1/f × i: Qhov L yog siab tshaj ntawm cov chav kawm nruab nrab.
Yuav ua li cas yog tus qauv ntawm txhais tau tias nyob rau hauv tas liseries?
Nruam series txhais tau tias qhov twg zaus tau muab nrog rau tus nqi ntawm qhov sib txawv hauv daim ntawv ntawm chav kawm ntawv. Piv txwv li. Ntawm no: … (iv) Ntxiv ob qho kev txwv thiab noj lawv qhov nruab nrab, peb tau txais qhov nruab nrab ntawm cov chav kawm ib ntus. Qhov nruab nrab tus nqi ntawm 20-30 yog; 20+30/2=25.
