Apps. and Interpretation for IBDP Maths Ebook 1 | Page 232

Your Practice Set – Applications and Interpretation for IBDP Mathematics
4. The weights of 13 students (in kg) are shown in the following stem-and-leaf diagram:
Stem Leaf
4 5 6 7 9
5 0 0 3 3 3 x
6 2 4 4
It is given that the inter-quartile range of the weights is 11.
(a) (i) Write down the lower quartile of the weights.
(ii)
Write down the upper quartile of the weights.
(b)
(c)
(iii) Hence, find the value of x .
Write down the range of the weights.
Write down the standard deviation of the data.
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