GCSE Statistics Revision List 2027
Every GCSE Statistics topic for the 2027 exams, from collecting and processing data through correlation, probability and probability distributions, each with a free guide and printable practice.
See how one of these works: Data Cleaning and Outliers (Foundation)
A nurse records the weights (kg) of 8 patients: 62, 65, 71, 68, 640, 70, 66, 69. (a) Identify the outlier. (b) Suggest a likely explanation. (c) Calculate the mean weight with the outlier removed.
- Compare each value with the rest: 640 kg is far larger than all the other weights (62 to 71 kg), so 640 is the outlier.
- A likely explanation is a data entry error, for example the decimal point was missed and the true value was 64.0 kg.
- Remove the outlier, leaving 7 values: 62, 65, 71, 68, 70, 66, 69.
- Sum the remaining values: 62 + 65 + 71 + 68 + 70 + 66 + 69 = 471.
- Divide by the number of values: 471 divided by 7 = 67.285714...
- Final answer: the outlier is 640 kg, likely a data entry error, and the mean weight of the remaining 7 patients is 67.3 kg (1 dp).
A data set of ages is: 12, 13, 12, 14, 13, 99. Which value is most likely an outlier?
99 (far higher than the rest, likely a recording error for an age).
Collecting Data
Processing and Representing Data
Summarising Data
Correlation and Time Series
Probability
Index Numbers
Probability Distributions
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