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 2, 4, 6, 8.
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5.
2 Find the mode of 3, 5, 5, 7, 9.
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5.
3 Find the median of 4, 7, 7, 9, 13.
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7.
Level 2 · Core
4 Find the median of 12, 5, 9, 3.
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(5 + 9) ÷ 2 = 7.
5 Find the mean of 4, 7, 7, 9, 13.
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8.
6 Find the mode of 1, 4, 6, 9, 12.
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No mode — nothing repeats.
Level 3 · Challenge
7 Pets: 0→4, 1→8, 2→5, 3→2, 4→1. Find the mean number of pets.
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1.4 pets.
8 Same table. Find the median. (20 values)
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Both the 10th and 11th are 1, so the median is 1.
9 Prices 2, 3, 4, 5, 86. Find the mean.
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20 — well above four of the five values, because 86 is an outlier.