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Maths Gcse Wjec-Eduqas Foundation

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  1. Scatter-Graphs-And-Correlation Wjec-Eduqas Foundation
    2 主题
  2. Statistical-Diagrams- Wjec-Eduqas Foundation
    7 主题
  3. Statistics-Toolkit Wjec-Eduqas Foundation
    8 主题
  4. Tree-Diagrams-And-Combined-Probability Wjec-Eduqas Foundation
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  5. Simple-Probability-Diagrams- Wjec-Eduqas Foundation
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  6. Probability-Toolkit Wjec-Eduqas Foundation
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  7. Transformations Wjec-Eduqas Foundation
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  8. Vectors Wjec-Eduqas Foundation
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  9. Pythagoras-And-Trigonometry Wjec-Eduqas Foundation
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  10. Congruence-Similarity-And-Geometrical-Proof Wjec-Eduqas Foundation
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  11. Volume-And-Surface-Area- Wjec-Eduqas Foundation
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  12. Circles-Arcs-And-Sectors Wjec-Eduqas Foundation
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  13. Area-And-Perimeter Wjec-Eduqas Foundation
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  14. Bearings-Scale-Drawing-Constructions-And-Loci- Wjec-Eduqas Foundation
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  15. 2D-And-3D-Shapes Wjec-Eduqas Foundation
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  16. Angles-In-Polygons-And-Parallel-Lines Wjec-Eduqas Foundation
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  17. Geometry-Toolkit Wjec-Eduqas Foundation
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  18. Exchange-Rates-And-Best-Buys Wjec-Eduqas Foundation
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  19. Standard-And-Compound-Units- Wjec-Eduqas Foundation
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  20. Direct-And-Inverse-Proportion- Wjec-Eduqas Foundation
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  21. Ratio-Problem-Solving- Wjec-Eduqas Foundation
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  22. Ratio-Toolkit Wjec-Eduqas Foundation
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  23. Sequences Wjec-Eduqas Foundation
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  24. Solving-Inequalities- Wjec-Eduqas Foundation
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  25. Real-Life-Graphs Wjec-Eduqas Foundation
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  26. Graphs-Of-Functions Wjec-Eduqas Foundation
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  27. Linear-Graphs Wjec-Eduqas Foundation
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  28. Coordinate-Geometry Wjec-Eduqas Foundation
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  29. Functions Wjec-Eduqas Foundation
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  30. Forming-And-Solving-Equations Wjec-Eduqas Foundation
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  31. Simultaneous-Equations Wjec-Eduqas Foundation
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  32. Solving-Quadratic-Equations- Wjec-Eduqas Foundation
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  33. Linear-Equations Wjec-Eduqas Foundation
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  34. Algebraic-Reasoning Wjec-Eduqas Foundation
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  36. Factorising Wjec-Eduqas Foundation
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  37. Expanding-Brackets Wjec-Eduqas Foundation
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  38. Algebraic-Roots-And-Indices Wjec-Eduqas Foundation
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  39. Algebra-Toolkit Wjec-Eduqas Foundation
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  40. Using-A-Calculator Wjec-Eduqas Foundation
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  41. Exact-Values Wjec-Eduqas Foundation
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  42. Rounding-Estimation-And-Error-Intervals Wjec-Eduqas Foundation
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  43. Fractions-Decimals-And-Percentages Wjec-Eduqas Foundation
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  44. Simple-And-Compound-Interest-Growth-And-Decay Wjec-Eduqas Foundation
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  45. Percentages Wjec-Eduqas Foundation
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  46. Fractions Wjec-Eduqas Foundation
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  47. Powers-Roots-And-Standard-Form Wjec-Eduqas Foundation
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  48. Types-Of-Number-Prime-Factors-Hcf-And-Lcm- Wjec-Eduqas Foundation
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  49. Number-Toolkit Wjec-Eduqas Foundation
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Exam code:C300

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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