Apps. and Interpretation for IBDP Maths Ebook 1 | Page 320

Your Practice Set – Applications and Interpretation for IBDP Mathematics
3. The following table shows the Art exam score x and the Music exam score y for six
students.
Art exam score ( x ) 95 90 80 80 65 70
Music exam score ( y ) 95 85 70 80 55 65
The above data is visualized by the scatter diagram below:
(a)
Plot and label the mean point M(80, 75) on the scatter diagram.
[2]
(b) Draw a suitable line of best fit on the scatter diagram.
[2]
This line of best fit can be used to make reliable estimates of the music exam score for a
known art exam score of a student, when this known art exam score lies between p and
q , where p
� q.
(c) Write down the values of p and q .
[2]
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