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19.2 Interpreting and drawing line graphs

2 The table shows the number of tourists, worldwide, from 2002 to 2010.
Each figure is rounded to the nearest 10 million.
Year 2002 2004 2006 2008 2010

Number of tourists (millions) 700 760 840 920 940
a Draw a line graph for this data. Extend the horizontal axis to 2012.
b Describe the trend in the data.
c Use your graph to estimate the number of tourists, worldwide, in 2007.
d Use your graph to predict the number of tourists, worldwide, in 2012.
3 The table shows the maximum and minimum daily temperatures recorded in Athens,
Greece, during one week in April.

Day Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Maximum temperature (°C) 17 18 20 22 21 20 18
Minimum temperature (°C) 13 13 14 16 14 15 14

a Using the same set of axes, draw line graphs to show this data.
b Describe the trend in both sets of data.
c On which day was the difference between the maximum and minimum temperature greatest?

4 The line graph shows the number of visits made to Wales
by people from the rest of the UK from 1990 to 2010. Number of visits made to Wales by
a Use the graph to estimate the number of visits people from the rest of the UK, 1990−2010
made by people in the UK to Wales in 1995. 50
b Between which two years was the biggest increase 45
in the number of visits made by people in Number of visits (millions) 40
the UK to Wales? 35
c Between which two years was the biggest decrease 30
in the number of visits made by people in 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
the UK to Wales? Year
d Is it possible to use this graph to predict the number
of visits made by people in the UK to Wales in 2012?
Explain your answer.
5 The line graph shows the average mass of a girl from Average mass of a girl, newborn to 18 years
newborn to 18 years old. 70
a Describe the trend in the data. 60
b During which two-year period does a girl gain
40
the most mass? Mass (kg) 50
c Use the graph to estimate the mass of a girl aged 15. 30
d Is it possible to predict the mass of a girl aged 22? 20
Explain your answer. 10
0
0 2 4 6 8 10 12 14 16 18 20 22
Age (years)

19 Interpreting and discussing results 181