Page 187 - MAT KS3 Y8 Cambridge CheckPoint

18.3 Interpreting and drawing line graphs

✦ Exercise 18.3 Company profit

1 The line graph shows the profit made each year by a
company over a six-year period.
a How much profit did the company make in: Prof it ($ million) 3 2
i 2006 ii 2007?
b In which year did the company make the largest profit? 1
c Between which two years was the greatest increase
in profit? 0
2006 2007 2008 2009 2010 2011
d Between which two years was the greatest decrease in profit? Year
e Describe the trend in the company profits over the six year
period.
2 Ian records the sales of skateboards at his shop each Sales of skateboards
month for one year. 20
The data is shown in the line graph. Number of skateboards 16
a How many skateboards did Ian sell in: 12
8
i March ii May? 4
b In which month did he sell the most skateboards?
0
c Between which two months did his sales double? J F MAM J J A S O N D
d Describe the trend in skateboard sales over the year. Month

3 The line graph shows the value of a house over a House value 2000–2010
ten-year period.
a What was the value of the house in: 200
i 2000 ii 2010? 180
b In which year did the house reach its greatest value? Value of house ($ thousands) 160
c Between which two years was the greatest increase 140
in the value of the house? 120
d Describe the trend in the value of the house over 100
the ten-year period. 0 2000 2002 2004 2006 2008 2010
e Use the graph to estimate the value of the house Year
in: i 2003 ii 2009.

For questions 4 and 5 work in a group of three or four.
i On your own, draw a line graph to show the data, describe the trend in the data and answer the question.
ii Compare your line graph, description and answers with those of the other members of your group.
Discuss the different scales that you each used in your graph and the descriptions you gave. Decide
which one is best. Check you gave the same answers to the questions.
4 The table shows the number of people staying in a guest house each month for one year.

Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of people 8 6 11 15 17 20 24 26 18 14 8 7
Between which two months did the number of people at the guest house change the most?
5 The table shows the average price of silver over a 25-year period.

Year 1985 1990 1995 2000 2005 2010
Average price of silver ($) 6.10 4.80 5.20 5.00 7.30 20.20
In which five-year period did the price of silver change the most?
18 Interpreting and discussing results 185