13.3 Kebarangkalian Peristiwa Pelengkap

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Mathematics

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2nd Grade

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Hard

NORSYILAWATI Moe

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13.3 Kebarangkalian Peristiwa Pelengkap

13.3.1Memerihal peristiwa lengkap

13.3.2Kebarangkalian peristiwa pelengkap

Contoh 1

Sebuah kotak mengandungi 6 cip biru , 2 cip hijau dan 8 cip merah. Sekeping cip kemudian di pilih secara rawak daripada kotak itu. Jika A ialah peristiwa mendapat cip merah, perihalkan peristiwa pelengkap bagi A.

Jawapan

(a) perkataan

A' = Peristiwa memilih bukan cip merah

(b) tatatanda set

A' = { B_{1 ,}B_{2 ,}B_{3 ,}B_4,B_{5 ,}B_{6 ,}H_{1 ,}H₂}

Contoh 2

Sebuah kotak pensel mengandungi 10 krayon biru , 3 krayon merah dan dua krayon kuning. Kira kebarangkalian krayon yang di pilih selain krayon merah.

Jawapan

Jumlah krayon = 15

Kebarangkalian krayon merah dipilih A

P(A) = $\frac{n\left(A\right)}{n\left(S\right)}=\frac{3}{15}=\frac{1}{5}$

Kebarangkalian krayon biru dan krayon kuning dipilih A'

P(A) = 1 -

\frac{1}{5}=\frac{4}{5}

Cuba Jawab

Sebuah bakul mengandungi 40 biji telur yang elok dan rosak. 10% biji telur didapati telah rosak. E ialah peristiwa memperoleh telur yang rosak. Hitung kebarangkalian mengambil sebiji telur yang tidak rosak secara rawak.

13.3 Kebarangkalian Peristiwa Pelengkap

13.3.1Memerihal peristiwa lengkap

13.3.2Kebarangkalian peristiwa pelengkap

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