Combined Events (Junior Cert Mathematics): Flashcards

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Combined Events
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Combined events

Probability of more than one thing happening

What to do for 'AND' rule

Multiply probabilities

Why multiply for 'AND' rule

Events independent; combined chance smaller

What to do for 'OR' rule

Add probabilities

Why add for 'OR' rule

Gives total chance of either event occurring

P(Heads on coin)P(\text{Heads on coin})

12\frac{1}{2}

P(rolling 6 on die)P(\text{rolling 6 on die})

16\frac{1}{6}

P(Heads AND 6)P(\text{Heads AND 6})

12×16=112\frac{1}{2} \times \frac{1}{6} = \frac{1}{12}

112\frac{1}{12} as a percentage

8.3%

Exam tip for solving probability problems

Show your work and write each step

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