1. The stem and leaf diagram below shows the average intake of fat weekly, in grams, of 60 adults volunteers in a medical research.
Stem Leaf
8 1 2 5 5 7 8 8
9 2 3 4 5 6 6 7 9
10 0 2 2 3 3 4 5 5 6 7 8 9
11 0 0 1 2 2 3 4 5 5 5 5 7 8 8 9 9
12 2 3 3 4 4 5 6 6 7
13 3 3 6 7 7
14 0 1 7
Key: 10 0 means 100
a) Determine the median and the interquartile range of the distribution. [4 marks]
b) Draw a box and whishers plot to represent the data. [3 marks]
c) The above circled observation was recorded wrongly from its actual value of 173.
Show how this actual value affect your box and whisker plot? [3 marks]
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