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The classical definition of probability
Definition: The classical definition of probability
Let us discuss experiments in which all elementary events have the same probability and is a set of all elementary events.
Probability of the event is the quotient of the number of favourable events by the number of all possible elementary events of this experimentexperiment/trialexperiment.
Use obtained information in exercises.
Task 2
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We flip a coin three times. What is the probability of getting at least two heads? Write the set of all elementary events of this experimentexperiment/trialexperiment.
Task 3
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How many lottery tickets are there, if there are 12 winning tickets and probability of getting a winning ticket is equal to ?
Task 4
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We draw one card from 52 cards. What is the probability of getting a red card?
Task 5
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There are 3 white spheres and 4 black spheres in the box. We take one sphere from the box. If it is white, then we roll the dice once and if it is black, we roll the dice twice. Present this experimentexperiment/trialexperiment on a tree diagram.
Task 6
An extra task:
We roll a six‑sided dice twice. On three sides of the dice there is number 1, on two there is number 3 and on the last one there is number 4. Make a tree diagram for this experimentexperiment/trialexperiment and calculate the probability of getting the sum on both dices equal to 2.
Do the revision exercises.
Exercises
Exercise 1
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Exercise 2
Two cards were drawn from a pack of 52 cards. What is the probability that both cards are aces?
Exercise 3
On the internet, look for information what event is called impossible and what is called certain. Describe the solution in English.
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Exercise 4
Wersja alternatywna ćwiczenia: Match Polish terms with their English equivalents. suma oczek Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice kula czarna Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice prawdopodobieństwo zdarzenia losowego Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice rzut kostką Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice doświadczenie losowe Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice
Wersja alternatywna ćwiczenia: Match Polish terms with their English equivalents. suma oczek Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice kula czarna Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice prawdopodobieństwo zdarzenia losowego Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice rzut kostką Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice doświadczenie losowe Możliwe odpowiedzi: 1. experiment/trial, 2. sum of numbers shown by the dice, 3. probability of an event, 4. black sphere, 5. roll of a dice
Match Polish terms with their English equivalents.
experiment/trial, black sphere, sum of numbers shown by the dice, roll of a dice, probability of an event
suma oczek
kula czarna
prawdopodobieństwo zdarzenia losowego
rzut kostką
doświadczenie losowe
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Glossary
black sphere
black sphere
kula czarna
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elementary event
elementary event
zdarzenie elementarne
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experiment/trial
experiment/trial
doświadczenie losowe
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flip of the coin
flip of the coin
rzut monetą
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probability of an event
probability of an event
prawdopodobieństwo zdarzenia losowego
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roll of a dice
roll of a dice
rzut kostką
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set of elementary events
set of elementary events
zbiór zdarzeń elementarnych
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sum of numbers shown by the dice
sum of numbers shown by the dice
suma oczek
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white sphere
white sphere
kula biała
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Keywords
elementary eventelementary eventelementary event – pojedynczy wynik doświadczenia
probability of an eventprobability of an eventprobability of an event – iloraz liczby zdarzeń elementarnych sprzyjających zdarzeniu przez liczbę wszystkich możliwych zdarzeń elementarnych tego doświadczenia