Analysis and Approaches for IBDP Maths Ebook 1 | Page 230

Your Practice Set – Analysis and Approaches for IBDP Mathematics
2. The following cumulative frequency diagram shows the lengths of 200 fish, in cm.
(a) (i) Write down the inter-quartile range of the length.
(ii)
(iii)
Write down the number of fish of length greater than 4 cm.
Find the percentage of fish of length between 1 cm and 2 cm.
(iv) 90% of the fish are longer than k cm. Find the value of k .
[8]
Fish of length greater than 3 cm are then being sold in the wet market. The price of the
fish is set to be 20 dollars times the length of the fish in centimetres.
(b)
Find the price of a fish of length 4.5 cm.
(c) 10% of the fish are priced higher than $r . Find the value of r .
[2]
[4]
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