Probabilità domande
Eventi singoli, eventi composti, ed estrazione senza reinserimento, con risposte in frazioni esatte.
Copre la probabilità di eventi singoli come dadi e monete, eventi composti come somme di dadi ed estrazioni di carte, ed estrazione senza reinserimento da un sacchetto di biglie.
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Domande di esempio di Probabilità
Le domande di esempio qui sotto sono al momento disponibili solo in inglese.
1. A card is drawn at random from a standard 52-card deck. What is the probability it is a heart?+
Risposta: 1/4
Step 1: A standard deck has 4 suits of 13 cards each, so there are 13 hearts out of 52 cards. Step 2: Probability = 13/52 = 1/4.
2. Two fair six-sided dice are rolled. What is the probability that the sum is 7?+
Risposta: 1/6
Step 1: There are 6 × 6 = 36 equally likely outcomes for two dice. Step 2: 6 of those outcomes add up to 7. Step 3: Probability = 6/36 = 1/6.
3. Two fair six-sided dice are rolled. What is the probability that the sum is 3?+
Risposta: 1/18
Step 1: There are 6 × 6 = 36 equally likely outcomes for two dice. Step 2: 2 of those outcomes add up to 3. Step 3: Probability = 2/36 = 1/18.
4. Two fair six-sided dice are rolled. What is the probability that the sum is 4?+
Risposta: 1/12
Step 1: There are 6 × 6 = 36 equally likely outcomes for two dice. Step 2: 3 of those outcomes add up to 4. Step 3: Probability = 3/36 = 1/12.
5. Two fair six-sided dice are rolled. What is the probability that the sum is 6?+
Risposta: 5/36
Step 1: There are 6 × 6 = 36 equally likely outcomes for two dice. Step 2: 5 of those outcomes add up to 6. Step 3: Probability = 5/36 = 5/36.
6. Two fair six-sided dice are rolled. What is the probability that the sum is 8?+
Risposta: 5/36
Step 1: There are 6 × 6 = 36 equally likely outcomes for two dice. Step 2: 5 of those outcomes add up to 8. Step 3: Probability = 5/36 = 5/36.