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S2

Interpret and construct frequency tables, bar charts, pie charts and pictograms (categorical data), vertical line charts (ungrouped discrete numerical data), tables and line graphs (time series)

Charts and tables

Worked answers, methods and verified real exam appearances for S2 on Edexcel GCSE Maths 1MA1.

Explanation

  • Match the display to the data. Use separated bars for categories, a vertical line chart for ungrouped discrete numbers, and joined points in time order for a time series.
  • A pictogram needs a clear key.
  • For a pie chart, sector angle=frequencytotal×360\text{sector angle}=\dfrac{\text{frequency}}{\text{total}}\times360^\circ.
  • Any graph needs clear labels, an even scale and accurate plotting.
  • Bar widths and gaps should be consistent, and unrelated categories should not be joined by lines.

Worked example

A 126126^\circ sector of a pie chart represents 4242 students. Find the total number of students.

  1. 1.The sector represents the fraction 126360\dfrac{126}{360} of the total.
  2. 2.Total =42÷126360=42×360126=120=42\div\dfrac{126}{360}=42\times\dfrac{360}{126}=120.

Answer: 120120 students.

Common mistakes

  • Don't fall into the trap of using frequency directly as an angle instead of scaling to 360360^\circ.
  • Don't fall into the trap of joining categorical bars or plotting a time series out of order.

Exam tip

After calculating pie-chart sectors, check that all sector angles add to 360360^\circ.

Worked practice

Q1
Tier 1 · Easy

1

The data are 2,3,2,5,4,3,2,4,5,22,3,2,5,4,3,2,4,5,2. Construct a frequency table for the values 22, 33, 44 and 55.

(2)

(Total for Question 1 is 2 marks)

Mark scheme

Mark scheme for question 1
QuestionAnswerMarkMark scheme
1
  • 2:42:4, 3:23:2, 4:24:2, 5:25:2.
2Tally each value once. The frequencies 4+2+2+2=104+2+2+2=10 match the number of data values.
Q2
Tier 2 · Standard

2

In a survey of 240240 journeys, 5454 are made by bicycle. Work out the angle of the bicycle sector in a pie chart.

(2)

(Total for Question 2 is 2 marks)

Mark scheme

Mark scheme for question 2
QuestionAnswerMarkMark scheme
2
  • 8181^\circ
2The bicycle fraction is 54/24054/240. Multiply by a full turn: 54240×360=81\dfrac{54}{240}\times360^\circ=81^\circ.
Q3
Tier 3 · Hard

3

Quarterly sales are Q1: 320320, Q2: 410410, Q3: 390390, Q4: 520520, and the following Q1: 350350. State the five points to plot on a time-series line graph. Work out the percentage change from the first Q1 to the following Q1 and explain why comparing Q4 directly with the following Q1 could mislead.

(4)

(Total for Question 3 is 4 marks)

Mark scheme

Mark scheme for question 3
QuestionAnswerMarkMark scheme
3
  • (Q1,320),(Q2,410),(Q3,390),(Q4,520),(next Q1,350)(\text{Q1},320),(\text{Q2},410),(\text{Q3},390),(\text{Q4},520),(\text{next Q1},350).
  • Percentage increase =9.375%=9.375\%.
  • Q4 and Q1 may have different seasonal patterns, so that comparison may not represent an underlying fall.
4Plot the values in time order and join consecutive points. Like-for-like Q1 change is 350320=30350-320=30, so the percentage change is 30/320×100=9.375%30/320\times100=9.375\%. Comparing different quarters confounds the change with possible seasonality.
Q4
Tier 1 · Easy

4

A vertical line chart shows the number of goals scored by a team in each match. The lines at 00, 11, 22 and 33 goals have frequencies 33, 88, 66 and 44 respectively. Write down the frequency for 22 goals and the modal number of goals.

(2)

(Total for Question 4 is 2 marks)

Mark scheme

Mark scheme for question 4
QuestionAnswerMarkMark scheme
4
  • The frequency for 22 goals is 66.
  • The modal number of goals is 11.
2Read the height of the line at 22 goals to get frequency 66. The greatest frequency is 88, at 11 goal, so the mode is 11.
Q5
Tier 2 · Standard

5

A café records the number of hot drinks sold on four consecutive Mondays as 4242, 4646, 4444 and 5151. Write down the four points for a time-series graph, using Monday number on the horizontal axis, and describe the overall trend.

(2)

(Total for Question 5 is 2 marks)

Mark scheme

Mark scheme for question 5
QuestionAnswerMarkMark scheme
5
  • (1,42)(1,42), (2,46)(2,46), (3,44)(3,44) and (4,51)(4,51).
  • The number of hot drinks sold shows an overall increase (also accept noting the fall from 4646 to 4444 between Mondays 22 and 33).
2Pair each Monday number with its sales value and plot the points in time order. Although sales fall from 4646 to 4444 between Mondays 22 and 33, they rise from 4242 to 5151 overall.
Q6
Tier 3 · Hard

6

A pie chart represents 300300 votes. Three sectors have angles 7272^\circ, 108108^\circ and 126126^\circ. Work out the angle of the fourth sector and the frequency represented by each of the four sectors.

(4)

(Total for Question 6 is 4 marks)

Mark scheme

Mark scheme for question 6
QuestionAnswerMarkMark scheme
6
  • Fourth angle =54=54^\circ.
  • The frequencies are 6060, 9090, 105105 and 4545, corresponding respectively to 7272^\circ, 108108^\circ, 126126^\circ and 5454^\circ.
4The missing angle is 360(72+108+126)=54360^\circ-(72^\circ+108^\circ+126^\circ)=54^\circ. Since 300/360=56300/360=\dfrac{5}{6}, multiply each angle by 56\dfrac{5}{6}: the frequencies are 6060, 9090, 105105 and 4545. They add to 300300.
Q7
Tier 2 · Standard

7

A survey of 4848 pupils records their favourite after-school activity. Sport has frequency 1414, music has frequency 1010 and drama has frequency 88. The remaining pupils choose art. A bar chart uses a scale of 1cm1\,\text{cm} for 22 pupils. Work out the frequency for art, write down the height of each of the four bars, and state whether the bars should touch.

(4)

(Total for Question 7 is 4 marks)

Mark scheme

Mark scheme for question 7
QuestionAnswerMarkMark scheme
7
  • Art frequency =16=16.
  • Bar heights: sport 7cm7\,\text{cm}, music 5cm5\,\text{cm}, drama 4cm4\,\text{cm} and art 8cm8\,\text{cm}.
  • The bars should not touch because the activities are categories.
4The art frequency is 48(14+10+8)=1648-(14+10+8)=16. Divide each frequency by 22 to use the stated scale, giving heights 77, 55, 44 and 8cm8\,\text{cm}. A categorical bar chart has gaps between its bars.
Q8
Tier 3 · Hard

8

A bar chart compares 6464 bookings on Monday with 7676 bookings on Tuesday. The vertical axis begins at 6060, so the visible parts of the bars have heights of 44 units and 1616 units. Sam says, ‘Tuesday had four times as many bookings as Monday.’ Is Sam correct? Work out the percentage increase from Monday to Tuesday and explain how the axis makes the chart misleading.

(4)

(Total for Question 8 is 4 marks)

Mark scheme

Mark scheme for question 8
QuestionAnswerMarkMark scheme
8
  • No, Tuesday did not have four times as many bookings as Monday.
  • The percentage increase is 18.75%18.75\%.
  • Starting the axis at 6060 makes the visible heights 44 and 1616, exaggerating the difference; the actual values are 6464 and 7676.
4The increase is 7664=1276-64=12, so the percentage increase is 12/64×100=18.75%12/64\times100=18.75\%. The ratio of the actual values is 76/64=1.187576/64=1.1875, not 44. The fourfold visual ratio comes only from subtracting the truncated-axis baseline of 6060.
Q9
Tier 3 · Hard

9

A time-series graph uses the number of months after January 2024 on the horizontal axis and the meter reading on the vertical axis. The readings are 120120 in January 2024, 150150 in April 2024, 132132 in October 2024 and 168168 in July 2025. Write down the four coordinates that should be plotted, in date order.

(4)

(Total for Question 9 is 4 marks)

Mark scheme

Mark scheme for question 9
QuestionAnswerMarkMark scheme
9
  • The coordinates are (0,120)(0,120), (3,150)(3,150), (9,132)(9,132) and (18,168)(18,168), in date order.
4The dates are 00, 33, 99 and 1818 months after January 2024. Pair each of these data values with its meter reading to give (0,120)(0,120), (3,150)(3,150), (9,132)(9,132) and (18,168)(18,168).
Q10
Tier 3 · Hard

10

A pie chart represents the after-school clubs chosen by 240240 pupils. The school has exactly these four clubs: coding, drama, art and music. The coding sector has angle 7272^\circ and represents 4848 pupils. There are 3232 pupils who choose drama. The numbers who choose art and music are in the ratio 5:35 : 3. Work out the angles of the art, music and drama sectors.

(4)

(Total for Question 10 is 4 marks)

Mark scheme

Mark scheme for question 10
QuestionAnswerMarkMark scheme
10
  • Art sector =150=150^\circ, music sector =90=90^\circ and drama sector =48=48^\circ.
4After the 4848 coding pupils and 3232 drama pupils, 2404832=160240-48-32=160 pupils remain. Split 160160 in the ratio 5:35 : 3 to get 100100 art pupils and 6060 music pupils. Each pupil represents 360/240=1.5360^\circ/240=1.5^\circ, so the three required angles are 150150^\circ, 9090^\circ and 4848^\circ.

Verified exam appearances

SeriesPaperQuestionMarksCalculatorTierLinks
2019-061FQ73Non-calculatorFoundationQPMS
2019-061FQ214Non-calculatorFoundationQPMS
2019-112FQ212AllowedFoundationQPMS
2019-063FQ72AllowedFoundationQPMS
2021-113FQ203AllowedFoundationQPMS
2024-113FQ172AllowedFoundationQPMS
2021-112FQ165AllowedFoundationQPMS
2021-113FQ93AllowedFoundationQPMS
2021-111FQ81Non-calculatorFoundationQPMS
2024-111FQ97Non-calculatorFoundationQPMS
2019-113FQ96AllowedFoundationQPMS
2019-063HQ42AllowedHigherQPMS
2019-111FQ184Non-calculatorFoundationQPMS
2024-113FQ154AllowedFoundationQPMS
2023-111FQ86Non-calculatorFoundationQPMS
2022-111FQ134Non-calculatorFoundationQPMS
2022-062FQ133AllowedFoundationQPMS
2021-111FQ116Non-calculatorFoundationQPMS
2022-061FQ61Non-calculatorFoundationQPMS
2024-063FQ133AllowedFoundationQPMS
2019-063HQ214AllowedHigherQPMS
2022-061FQ83Non-calculatorFoundationQPMS
2021-112FQ83AllowedFoundationQPMS
2019-111FQ64Non-calculatorFoundationQPMS
2022-112FQ93AllowedFoundationQPMS
2023-063FQ96AllowedFoundationQPMS
2022-112FQ155AllowedFoundationQPMS
2024-063FQ72AllowedFoundationQPMS
2022-062FQ154AllowedFoundationQPMS
2023-112FQ164AllowedFoundationQPMS
2019-062FQ95AllowedFoundationQPMS
2024-062FQ65AllowedFoundationQPMS
2019-063FQ263AllowedFoundationQPMS
2022-113HQ33AllowedHigherQPMS
2022-062FQ93AllowedFoundationQPMS
2021-112FQ183AllowedFoundationQPMS
2022-063FQ262AllowedFoundationQPMS
2023-113FQ64AllowedFoundationQPMS
2024-113FQ224AllowedFoundationQPMS
2022-061FQ213Non-calculatorFoundationQPMS
2019-063FQ272AllowedFoundationQPMS
2024-063FQ143AllowedFoundationQPMS
2023-061FQ232Non-calculatorFoundationQPMS
2023-112FQ173AllowedFoundationQPMS
2022-113FQ62AllowedFoundationQPMS
2023-063FQ124AllowedFoundationQPMS
2022-113FQ233AllowedFoundationQPMS
2024-061FQ74Non-calculatorFoundationQPMS
2022-113FQ162AllowedFoundationQPMS
2019-063FQ183AllowedFoundationQPMS

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