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Maths Gcse Edexcel Higher

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  1. Scatter-Graphs-And-Correlation Edexcel Higher
    2 主题
  2. Cumulative-Frequency-And-Box-Plots Edexcel Higher
    4 主题
  3. Histograms Edexcel Higher
    3 主题
  4. Statistical-Diagrams Edexcel Higher
    7 主题
  5. Averages-Ranges-And-Data Edexcel Higher
    8 主题
  6. Combined-And-Conditional-Probability Edexcel Higher
    3 主题
  7. Tree-Diagrams Edexcel Higher
    1 主题
  8. Simple-Probability-Diagrams Edexcel Higher
    3 主题
  9. Transformations Edexcel Higher
    5 主题
  10. Vectors Edexcel Higher
    6 主题
  11. 3D-Pythagoras-And-Trigonometry Edexcel Higher
    1 主题
  12. Sine-Cosine-Rule-And-Area-Of-Triangles Edexcel Higher
    4 主题
  13. Pythagoras-And-Trigonometry Edexcel Higher
    4 主题
  14. Area-And-Volume-Of-Similar-Shapes Edexcel Higher
    1 主题
  15. Congruence-Similarity-And-Geometrical-Proof Edexcel Higher
    5 主题
  16. Volume-And-Surface-Area Edexcel Higher
    3 主题
  17. Circles-Arcs-And-Sectors Edexcel Higher
    2 主题
  18. Area-And-Perimeter Edexcel Higher
    4 主题
  19. Circle-Theorems Edexcel Higher
    7 主题
  20. Bearings-Scale-Drawing-Constructions-And-Loci Edexcel Higher
    5 主题
  21. Angles-In-Polygons-And-Parallel-Lines Edexcel Higher
    3 主题
  22. Symmetry-And-Shapes Edexcel Higher
    6 主题
  23. Exchange-Rates-And-Best-Buys Edexcel Higher
    2 主题
  24. Standard-And-Compound-Units Edexcel Higher
    5 主题
  25. Direct-And-Inverse-Proportion Edexcel Higher
    2 主题
  26. Problem-Solving-With-Ratios Edexcel Higher
    2 主题
  27. Ratios Edexcel Higher
    3 主题
  28. Sequences Edexcel Higher
    4 主题
  29. Transformations-Of-Graphs Edexcel Higher
    2 主题
  30. Graphing-Inequalities Edexcel Higher
    2 主题
  31. Solving-Inequalities Edexcel Higher
    2 主题
  32. Real-Life-Graphs Edexcel Higher
    4 主题
  33. Estimating-Gradients-And-Areas-Under-Graphs Edexcel Higher
    2 主题
  34. Equation-Of-A-Circle Edexcel Higher
    2 主题
  35. Graphs-Of-Functions Edexcel Higher
    6 主题
  36. Linear-Graphs Edexcel Higher
    4 主题
  37. Coordinate-Geometry Edexcel Higher
    4 主题
  38. Functions Edexcel Higher
    3 主题
  39. Forming-And-Solving-Equations Edexcel Higher
    3 主题
  40. Iteration Edexcel Higher
    1 主题
  41. Simultaneous-Equations Edexcel Higher
    2 主题
  42. Quadratic-Equations Edexcel Higher
    4 主题
  43. Linear-Equations Edexcel Higher
    1 主题
  44. Algebraic-Proof Edexcel Higher
    1 主题
  45. Rearranging-Formulas Edexcel Higher
    2 主题
  46. Algebraic-Fractions Edexcel Higher
    4 主题
  47. Completing-The-Square Edexcel Higher
    1 主题
  48. Factorising Edexcel Higher
    6 主题
  49. Expanding-Brackets Edexcel Higher
    3 主题
  50. Algebraic-Roots-And-Indices Edexcel Higher
    1 主题
  51. Introduction Edexcel Higher
    7 主题
  52. Using-A-Calculator Edexcel Higher
    1 主题
  53. Surds Edexcel Higher
    2 主题
  54. Rounding-Estimation-And-Bounds Edexcel Higher
    2 主题
  55. Fractions-Decimals-And-Percentages Edexcel Higher
    3 主题
  56. Simple-And-Compound-Interest-Growth-And-Decay Edexcel Higher
    4 主题
  57. Percentages Edexcel Higher
    3 主题
  58. Fractions Edexcel Higher
    4 主题
  59. Powers-Roots-And-Standard-Form Edexcel Higher
    4 主题
  60. Prime-Factors-Hcf-And-Lcm Edexcel Higher
    4 主题
  61. Number-Operations Edexcel Higher
    10 主题
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Exam code:1MA1

Stem & leaf diagrams

What is a stem-and-leaf diagram?

  • A stem–and–leaf diagram is a simple way to display an ordered list of data using digits

  • Two-digit numbers are split into a tens digit (the stem) and a units digit (the leaf)

    • 25 becomes 2 | 5

    • The stem is written vertically and the leaves are written horizontally (in order)

  • The following diagram shows the ages below

    • 11, 18, 20, 21, 25, 28, 29, 35, 36, 40

 

 Age

1

 1 8

2

 0 1 5 8 9

3

 5 6

4

 0

Key: 1|8 means 18 years old

What is the key on a stem-and-leaf diagram?

  • The key shows how values are formed from digits

    • It should include units

  • Other keys are possible

    • 2 | 5 represents 2.5 degrees

    • 2 | 5 represents 2005 people

Stems and Leaves

How do I find the median from a stem-and-leaf diagram?

  • The median is the middle number

    • Data values are already in order

    • You can cross out numbers from the beginning and end until they meet in the middle

      • Remember that the highest number will be at the end of the last stem

      • If two numbers remain in the middle, find the midpoint between them

Examiner Tips and Tricks

A common mistake when finding the median is to write down the leaf only (median = 6) rather than the stem and leaf (median = 26).

Worked Example

A hospital is investigating a new drug that claims to reduce blood pressure.
The reductions in blood pressure, measured in mmHg (millimetres of mercury), for 11 patients are shown below.

12 31 24 18 21 34 40 19 23 17 16

(a) Draw a stem and leaf diagram to show these results.

Split each value into its tens digit (stem) and units digit (leaf)
The values are not yet in order 

 

 Blood pressure reduction

1

 2 8 9 7 6

2

 4 1 3

3

 1 4

4

 0

Put the values in order
Write down the key 

 

 Blood pressure reduction

1

 2 6 7 8 9

2

 1 3 4

3

 1 4

4

 0

Key: 1|2 means a blood pressure reduction of 12 mmHg

(b) Use your stem and leaf diagram to find the median blood pressure reduction.

Find the middle value
This is the 6th patient 

 

 Blood pressure reduction

1

 2 6 7 8 9

2

circle enclose 1 3 4

3

 1 4

4

 0

The median has a leaf of 1 and a stem of 2

The median is 21 mmHg

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