IB Maths AA SL 4.3 Summary statistics Question Bank

Practise IB Mathematics SL/HL 4.3 by applying summary statistics methods to exam-style questions.

Exam points

identify the mathematical structure, variable or representation
select and apply the correct theorem, formula or algorithm
check the result using units, domain, graph or logical reasoning

[Maximum number: 3]

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

Figure for Question SL 4.3—Summary statistics question 1 — IB Maths AA SL

Estimate the mean monthly income for families living in a villa.

evidence of using correct mid-interval values (1500,3000,4500)
attempt to substitute into $\frac{\sum f x}{\sum f}$
eg $\frac{1500 \times 64+3000 \times p+4500 \times 122}{64+585+122}$
3112.84

3110 [3110, 3120] (dollars)

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SL 4.3—Summary statistics question 1