IB Maths AA SL 4.5 Probability Basics Questions

Practise representing sample spaces and calculating probabilities, complements and expected frequencies from outcomes, events and relative-frequency data.

Exam points

Calculate basic probabilities from equally likely outcomes, frequency tables and complements.
Use addition and multiplication rules for combined or sequential events.
Model continuous-time or trigonometric contexts by finding intervals that satisfy a probability condition.

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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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The following cumulative frequency graph shows the monthly income, I dollars, of 2000 families.

Figure for Question IB Maths AA SL 4.5 Probability Basics Questions question 1 — IB Maths AA SL

A family is chosen at random.

Find the probability that this family lives in an apartment.

correct working
eg $\quad 436+765+28$
0.6145 (exact)
$\frac{1229}{2000}, 0.615[0.614,0.615]$

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IB Maths AA SL 4.5 Probability Basics Questions question 1