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.
Level 1 · Warm-up
1 Find the mean of 4, 6 and 8.
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18 ÷ 3 = 6.
2 Find the mode of 4, 4, 6, 7, 9.
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4 — it is the only value that repeats.
3 Find the range of 3, 5, 6, 8, 8.
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8 − 3 = 5.
Level 2 · Core
4 Find the median of 7, 3, 9, 4, 5.
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Sorted: 3, 4, 5, 7, 9, so the median is 5.
5 Find the mean of 3, 5, 6, 8, 8.
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30 ÷ 5 = 6.
6 Find the median of 10, 2, 7, 5.
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Sorted: 2, 5, 7, 10, so (5 + 7) ÷ 2 = 6.
Level 3 · Challenge
7 What is the mode of 2, 2, 5, 7, 7?
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Both 2 and 7 — each appears twice, so this set has two modes.
8 Test scores are 6, 7, 7, 7, 8, 10, 11. Find the mean.
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56 ÷ 7 = 8.
9 Same scores: 6, 7, 7, 7, 8, 10, 11. Find the median.
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The 4th score is 7, with three scores below it and three above.