Analysis and Approaches for IBDP Maths Ebook 1 | Page 233

(a) Write down the median of the amount of time for presentation.
[2]
(b) Write down the inter-quartile range of the amount of time for presentation.
[2]
(c) Find the number of secretaries whose time for presentation is within 5 minutes of
the upper quartile.
[3]
(d) 87.5% of the secretaries spent more than k minutes to complete a presentation.
Find the value of k .
[3]
The times for presentation of greater than r minutes are considered outliers.
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(e) Find the value of r .
[3]
(f) A secretary is chosen at random. Find the probability that the secretary spent more
than r minutes for presentation.
[2]
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