IB Maths AI SL 4.5 Probability Basics Questions

Practise representing sample spaces and calculating probabilities, complements and expected frequencies, then checking validity and interpreting the experiment.

Exam points

Define trial, outcome, sample space, event and relative frequency, and represent a sample space with a list or table.
Calculate probabilities, complements and expected numbers of occurrences from equally likely outcomes.
Check that probabilities are valid and interpret the result in the stated experiment or context.

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Study SL 4.5—Probability basics conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Elsie, a librarian, wants to investigate the length of time, T minutes, that people spent in her library on a particular day.

Find the probability a visitor spends at least 60 minutes in the library.

$\quad \frac{22}{160}\left[0.138,0.1375,13.75 \%, \frac{11}{80}\right]$

Note: Award A1 for correct numerator, A1 for correct denominator.

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IB Maths AI SL 4.5 Probability Basics Questions question 1