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Maths Gcse Edexcel Foundation

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  1. Scatter-Graphs-And-Correlation Edexcel Foundation
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  2. Statistical-Diagrams Edexcel Foundation
    8 主题
  3. Statistics-Toolkit Edexcel Foundation
    7 主题
  4. Tree-Diagrams-And-Combined-Probability Edexcel Foundation
    2 主题
  5. Simple-Probability-Diagrams Edexcel Foundation
    4 主题
  6. Probability-Toolkit Edexcel Foundation
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  7. Transformations Edexcel Foundation
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  8. Vectors Edexcel Foundation
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  9. Volume-And-Surface-Area Edexcel Foundation
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  10. Circles-Arcs-And-Sectors Edexcel Foundation
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  11. Area-And-Perimeter Edexcel Foundation
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  12. Pythagoras-And-Trigonometry Edexcel Foundation
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  13. Congruence-Similarity-And-Geometrical-Proof Edexcel Foundation
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  14. Bearings-Scale-Drawing-Constructions-And-Loci Edexcel Foundation
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  15. 2D-And-3D-Shapes Edexcel Foundation
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  16. Angles-In-Polygons-And-Parallel-Lines Edexcel Foundation
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  17. Geometry-Toolkit Edexcel Foundation
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  18. Exchange-Rates-And-Best-Buys Edexcel Foundation
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  19. Standard-And-Compound-Units Edexcel Foundation
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  20. Direct-And-Inverse-Proportion Edexcel Foundation
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  21. Ratio-Problem-Solving Edexcel Foundation
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  22. Ratio-Toolkit Edexcel Foundation
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  23. Sequences Edexcel Foundation
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  24. Solving-Inequalities Edexcel Foundation
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  25. Real-Life-Graphs Edexcel Foundation
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  26. Graphs-Of-Functions Edexcel Foundation
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  27. Linear-Graphs Edexcel Foundation
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  28. Coordinate-Geometry Edexcel Foundation
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  29. Functions Edexcel Foundation
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  30. Forming-And-Solving-Equations Edexcel Foundation
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  31. Simultaneous-Equations Edexcel Foundation
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  32. Solving-Quadratic-Equations Edexcel Foundation
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  33. Linear-Equations Edexcel Foundation
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  34. Algebraic-Reasoning Edexcel Foundation
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  35. Rearranging-Formulas Edexcel Foundation
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  36. Factorising Edexcel Foundation
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  37. Expanding-Brackets Edexcel Foundation
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  38. Algebraic-Roots-And-Indices Edexcel Foundation
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  39. Algebra-Toolkit Edexcel Foundation
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  40. Using-A-Calculator Edexcel Foundation
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  41. Exact-Values Edexcel Foundation
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  42. Rounding-Estimation-And-Error-Intervals Edexcel Foundation
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  43. Fractions-Decimals-And-Percentages Edexcel Foundation
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  44. Simple-And-Compound-Interest-Growth-And-Decay Edexcel Foundation
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  45. Percentages Edexcel Foundation
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  46. Fractions Edexcel Foundation
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  47. Powers-Roots-And-Standard-Form Edexcel Foundation
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  48. Types-Of-Number-Prime-Factors-Hcf-And-Lcm Edexcel Foundation
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  49. Number-Toolkit Edexcel Foundation
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Exam code:1MA1

Range

What is the range?

  • The range is the difference between the highest value and the lowest value

    • range = highest – lowest

      • For example, the range of 1, 2, 5, 8 is 8 – 1 = 7

  • It measures how spread out the data is

    • Ranges of different data sets can be compared to see which is more spread out

  • Be careful with negatives

    • The range of -2, -1, 0, 4 is 4 – (-2) = 6

How do I know when to use the range?

  • The range is a simple measure of how spread out the data is

    • The range does not measure an average value

  • It should not be used if there are any extreme values (outliers)

    • For example, the range of 1, 2, 5, 80 is 80 – 1 = 79

      • This is not a good measure of spread

      • The range is affected by extreme values

Examiner Tips and Tricks

  • If asked to find the range in an exam, make sure you show your subtraction clearly (don’t just write down the answer).

Worked Example

Find the range of the following data.

3.4

4.2

2.8

3.6

9.2

3.1

2.9

3.4

3.2

3.5

3.7

3.6

3.2

3.1

2.9

4.1

3.6

3.8

3.4

3.2

4.0

3.7

3.6

2.8

3.9

3.1

3.0

Range = highest value – lowest value

9.2 – 2.8

The range is 6.4

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