Edexcel IGCSE Math A 6.1.C Statistical diagrams

Practise reading statistical diagrams to extract values, compare categories and use chart scales to answer short data questions.

Exam points

read a value or category from a bar chart, pictogram or pie chart
compare two categories on a diagram to find a difference or matching label
use the chart scale to calculate a total or missing count from the diagram

[Maximum number: 5]

All the students in year 10 and all the students in year 11 named their favourite science subject from Biology, Chemistry and Physics.

The pie chart shows information about the results for the year 10 students.
The table shows information about the results for the year 11 students.

Pie chart for year 10

Table for year 11

There are 300 students in year 10
There are 320 students in year 11
More students in year 10 than in year 11 said Biology was their favourite science subject.

How many more?

ABCDE is a regular pentagon.
DEFGHI is a regular hexagon.
AF is a straight line.
Work out the size of angle EAF

3x+6+5x+8+7x-9=320

15x+5=320\quad\Rightarrow\quad x=21

Year 11 Biology:

3x+6=3(21)+6=69

Year 10 Biology:

\frac{126}{360}\times300=105

Difference:

105-69=36

Final answer:

M1 for a correct equation or method to find x for year 11.
A1 for x=21 or 3x=63.
M1ft for finding the number for year 11 Biology.
M1 independent for finding the number for year 10 Biology.
A1 cao, dependent on the previous A1.

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6.1.C Statistical diagrams question 1