Introduction to Probability (Junior Cert Mathematics): Flashcards

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Introduction to Probability
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What does probability measure?

How likely something is to happen

Range of probability values

From 00 to 11

Meaning of probability 00

Impossible - it will never happen

Meaning of probability 11

Certain - it will definitely happen

Meaning of probability 0.50.5

Even chance - equally likely to happen or not

Probability formula

rac{ ext{Number of successful outcomes}}{ ext{Total number of possible outcomes}}

Successful outcomes in probability

The outcomes you are interested in

Total outcomes in probability

All possible outcomes

P(rolling 44 on 66-sided die)

rac{1}{6}

Probability value 0.250.25 description

Unlikely

Probability value 0.750.75 description

Likely

Sum of all probabilities in a situation

11

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