Opening Maths Unlocked
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Opening Maths Unlocked
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GCSE MATHS PRACTICE
Mean, median and mode describe central tendency. The mean is the total divided by the number of values. The median is the middle value after ordering the data; for an even number of values, average the middle two. The mode is the most frequent value. Range measures spread, not central tendency: subtract the minimum from the maximum. In a frequency table, each value occurs as many times as its frequency.
Updated 12 October 2026
Five plants have heights 8, 11, 9, 12 and 10 cm. Find their mean height.
Answer: 10 cm
Find the mode and range of 4, 7, 3, 7, 9, 7, 5.
Find the median of 12, 5, 9, 15, 8, 11.
Six journeys take 14, 18, 20, 16, 22 and 24 minutes. Find the mean journey time.
The table shows the number of books read by 10 pupils. Find the mean number of books read.
| Books read | Frequency (pupils) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 3 |