Apps. and Interpretation for IBDP Maths Ebook 1 | Page 251

Travelling times of greater than r minutes are considered outliers.
(e) Find the value of r .
[3]
As it was impossible to ask every student, the Head of school arranged the student names
in alphabetical order and then asked every 5th student on the list.
(f)
Identify the sampling technique used.
4. The following cumulative frequency diagram shows the amount of time taken by 80
secretaries to complete a presentation.
[1]
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