Last updated on Sep 20, 2026

The Basics of Probability (Junior Cert Mathematics): Flashcards

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Relative Frequency and Carrying Out Experiments

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Define relative frequency

Estimate of probability based on actual experiments/trials

Relative frequency formula

$\frac{\text{Times event happens}}{\text{Total trials}}$

Meaning of 'total number of trials'

How many times you try the experiment

Meaning of 'times event happens'

How often the thing you're interested in occurs

20 die rolls, $6$ appears 3 times. Relative frequency?

$\frac{3}{20}$ or $0.15$ (15%)

True probability: rolling a $6$ on fair die

$\frac{1}{6}$ or about $0.167$ (16.7%)

20 of 52 weekends rain. Relative frequency?

$\frac{20}{52}$ or about 38%

Effect of more trials on probability estimate

More accurate/closer to true probability

When is relative frequency useful?

When exact probability unknown or real-life situations

Relative frequency is based on

Real data from performing experiments

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