Page 189 - Mathematics Coursebook

19.3 Drawing conclusions

) Exercise 19.3

1 Mari and Aiden go to different schools.
The pictograms show how the students in Mari’s class and in Aiden’s class travel to school.
Mari’s class Aiden’s class
Walk Walk
Cycle Cycle
Bus Bus
Car Car
Key: represents 2 students Key: represents 2 students

a Work out the number of students in: i Mari’s class ii Aiden’s class.
b Compare the pictograms and make two comments.
c Do you think that the students in Mari’s class live near to their school?
Explain your answer.
d Do you think that students in Aiden’s class live near to their school?
Explain your answer.
2 Abeeku carries out a survey on the favourite sport of the students in his year group at school. The
bar charts show his results.
Boys’ favourite sports Girls’ favourite sports
20 20
18
18
Number of boys 14 8 Number of girls 14 8
16
16
12
12
10
10
4 6 6 4
2 2
0 0
Cricket Football Hockey Rugby Tennis Cricket Football Hockey Rugby Tennis
a Compare the bar charts and make two comments.
b Which sport is the favourite for the same number of boys as girls?
c Which sport is the favourite of twice as many girls as boys?
d Write down the modal sport for i the boys ii the girls.
3 Mrs Kaul gives the students in her class a reading test and a spelling test.
The frequency diagrams show the results of the tests.
Reading test results Spelling test results

16 16
14
Frequency 14 8 Frequency 12 8
12
10
10
4 6 6 4
2 2
0 0
1–10 11–20 21–30 31–40 41–50 1–10 11–20 21–30 31–40 41–50
Score Score
a Work out the number of students that took: i the reading test ii the spelling test.
b Give a possible reason why your two answers in part a are different.
c Compare the bar charts and make two comments.
d Write down the modal score for: i the reading test ii the spelling test.

188 19 Interpreting and discussing results