Definition of Probability (Leaving Cert Mathematics): Quizzes

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Definition of Probability
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What does probability measure?

How likely an event is to occur

What is the formula for P(E)P(E)?

Favourable outcomesTotal outcomes\frac{\text{Favourable outcomes}}{\text{Total outcomes}}

What is the probability of rolling a 33 on a fair 66-sided die?

16\frac{1}{6}

What is the complement of an event EE?

The event that EE does not occur

If P(E)=0.4P(E) = 0.4, what is P(E′)P(E')?

0.60.6

If P(E′)=0.25P(E') = 0.25, what is P(E)P(E)?

0.750.75

What does P(E′)P(E') equal?

1−P(E)1 - P(E)

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