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Probability Scale Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Probability Scale
A scale from 0 to 1 used to measure how likely an event is to occur.
Probability of 0
Represents an impossible event.
Probability of 1
Represents a certain event.
Probability of 0.5
Represents an event that is equally likely to happen or not happen.
Impossible Event
An event that cannot happen, with a probability of 0.
Certain Event
An event that will definitely happen, with a probability of 1.
Likely Event
An event with a probability closer to 1 than 0.
Unlikely Event
An event with a probability closer to 0 than 1.
Even Chance
An event with a probability of 0.5, meaning it is equally likely to happen or not.
Expressing Probability
Probability can be expressed as a fraction, decimal, or percentage.
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