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    PracticeAQA GCSEAQA GCSE Maths Foundation Tier Paper 1 Non-CalculatorQuestion 21.3
    Easy1 markMultiple Choice
    StatisticsStatisticsRangeSpreadFoundation

    AQA GCSE · Question 21.3 · Statistics

    Each number in a list is increased by 10. For the statement "The range is increased by 10", tick one box.

    Answer options:

    A.

    True

    B.

    False

    C.

    Cannot tell

    How to approach this question

    1. **Understand the range:** The range is the difference between the highest and lowest values. 2. **Consider an example:** Let the list be {2, 3, 5, 9}. The lowest value is 2, the highest is 9. The range is 9 - 2 = 7. 3. **Apply the change:** Increase each number by 10. The new list is {12, 13, 15, 19}. 4. **Find the new range:** The new lowest value is 12, the new highest is 19. The new range is 19 - 12 = 7. 5. **Compare:** The original range was 7, the new range is 7. The range has not changed. 6. **Generalise:** The range is (highest value) - (lowest value). The new range is (highest value + 10) - (lowest value + 10) = highest value + 10 - lowest value - 10 = highest value - lowest value. The range stays the same. The statement is false.

    Full Answer

    B.False✓ Correct
    The range of a data set is the difference between the maximum value and the minimum value. Let's take an example data set: `S = {1, 3, 6, 8, 9}`. The maximum value is 9 and the minimum value is 1. The range = 9 - 1 = 8. Now, let's increase each number in the list by 10 to create a new set, `S`. `S = {11, 13, 16, 18, 19}`. In the new set, the maximum value is 19 and the minimum value is 11. The new range = 19 - 11 = 8. The range has not changed. Algebraically, if the original max is `M` and the original min is `m`, the range is `M - m`. After adding 10 to every number, the new max is `M + 10` and the new min is `m + 10`. The new range is `(M + 10) - (m + 10) = M + 10 - m - 10 = M - m`. The range is unchanged. Therefore, the statement "The range is increased by 10" is **False**.

    Common mistakes

    ✗ Thinking that because all the numbers increase, the spread must also increase.\n✗ Confusing range with one of the averages.
    Question 21.2All questionsQuestion 22.1

    Practice the full AQA GCSE Maths Foundation Tier Paper 1 Non-Calculator

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