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 Which graph is used for CATEGORICAL data — a column graph or a histogram?
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A column graph.
2 Do histogram bars have gaps between them?
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No — the bars touch.
3 With key "2 | 3 means 23", what value is "4 | 5"?
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45.
Level 2 · Core
4 A dot plot shows 4 dots at 0, 8 at 1, 5 at 2, 2 at 3, 1 at 4. What is the mode?
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1 (8 dots).
5 Same dot plot. What is the range?
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4.
6 What must every stem-and-leaf plot include, besides stems and leaves?
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A key, e.g. "2 | 3 means 23".
Level 3 · Challenge
7 Scores 23, 25, 27, 31, 34, 34, 38, 42, 45, 51. What is the range?
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51 − 23 = 28.
8 Same scores. What is the median? (10 values)
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(34 + 34) ÷ 2 = 34.
9 A graph starts its vertical scale at 5 instead of 0. What is the effect?
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It exaggerates the differences between bars, making the graph misleading.