Pelan

Kalkulator Kebarangkalian

Kira kebarangkalian daripada kesudahan yang diingini dan jumlah kesudahan, atau gabungkan dua peristiwa tak bersandar (A dan B, A atau B, kedua-duanya tidak, tepat satu).

Kesudahan yang anda mahu, cth. 3 bola merah
Semua kesudahan yang sama kemungkinan

Keputusan

Masukkan nilai dan tekan Kira untuk melihat keputusan.

Formula

P(E)=favourable outcomestotal outcomesP(E) = \frac{\text{favourable outcomes}}{\text{total outcomes}}

For equally likely outcomes.

P(not E)=1−P(E)P(\text{not } E) = 1 - P(E)

The complement: the event does not happen.

P(A∩B)=P(A) P(B)P(A \cap B) = P(A)\,P(B)

Both happen, when A and B are independent.

P(A∪B)=P(A)+P(B)−P(A∩B)P(A \cup B) = P(A) + P(B) - P(A \cap B)

At least one happens.

Cara menggunakan kalkulator ini

  1. For one event, enter how many outcomes you want and how many there are in total.
  2. For two independent events, enter each probability as a fraction (1/2) or a decimal (0.5).

Contoh berserta jalan kerja

3 red balls in a bag of 8

P(red) = 3/8 = 0.375 = 37.5%.

P(not red) = 1 − 3/8 = 5/8.

The odds of red are 3 : 5 (3 for, 5 against).

Soalan lazim

What does independent mean?

One event does not change the chance of the other — like two separate coin flips.

What is the difference between probability and odds?

Probability compares favourable outcomes with all outcomes (3/8); odds compare favourable with unfavourable (3 : 5).