Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 Find the range of 3, 8, 5, 11, 2.
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9.
2 Find the range of 4, 5, 5, 6, 5.
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2.
3 Can a range ever be negative?
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No — a negative answer means you subtracted the wrong way round.
Level 2 · Core
4 Find the range of 12, 7, 19, 4, 15.
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15.
5 Find the range of test scores 23, 51, 34, 42.
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28.
6 A dot plot has its leftmost dot at 0 and its rightmost at 4. What is the range?
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4.
Level 3 · Challenge
7 Find the range of 12, 14, 15, 15, 16, 17, 48.
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36 — inflated by the outlier.
8 Remove the 48 from that set. What is the new range?
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5 — a much fairer description of the other six values.
9 Two sets have the same mean but different ranges. What does the range tell you that the mean cannot?
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The spread — how consistent or variable the values are.