Worksheet library · GCSE
Foundation-Tier Topics GCSE Statistics Worksheets, Questions and Revision
22 original Foundation-Tier Topics worksheet packs - 273 printable pages with full mark schemes. Statistics topics examined only on the foundation tier. View any pack in the browser or open the print-ready PDF.
See the method: 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).
1.1 Data Cleaning and Outliers (Foundation)12p + answers · 68 marks · PDF
1.1d Data Cleaning and Outliers (Foundation): Fluency and Exam Drill5p + answers · 40 marks · PDF
4.1 Correlation and Causation (Foundation)11p + answers · 52 marks · PDF
4.1d Correlation and Causation (Foundation): Fluency and Exam Drill5p + answers · 40 marks · PDF
5.1 Risk (Foundation)12p + answers · 85 marks · PDF
5.1d Risk (Foundation): Fluency and Exam Drill5p + answers · 40 marks · PDF
3.1 Skewness by Inspection11p + answers · 72 marks · PDF
3.1d Skewness by Inspection: Fluency and Exam Drill5p + answers · 40 marks · PDF
3.2 Percentiles12p + answers · 82 marks · PDF
3.2d Percentiles: Fluency and Exam Drill6p + answers · 40 marks · PDF
6.1 Crude Rate and Rates of Change11p + answers · 76 marks · PDF
6.1d Crude Rate and Rates of Change: Fluency and Exam Drill5p + answers · 40 marks · PDF
4.2 Spearman's Rank Interpretation12p + answers · 61 marks · PDF
4.2d Spearman's Rank Interpretation: Fluency and Exam Drill6p + answers · 40 marks · PDF
5.2 Conditional Probability (Foundation)12p + answers · 80 marks · PDF
5.2d Conditional Probability (Foundation): Fluency and Exam Drill7p + answers · 40 marks · PDF
1.2 Estimating from Samples (Foundation)11p + answers · 72 marks · PDF
1.2d Estimating from Samples (Foundation): Fluency and Exam Drill5p + answers · 40 marks · PDF
2.1 Spreadsheets and ICT (Foundation)10p + answers · 60 marks · PDF
1.3 Stratified Sampling (Foundation)11p + answers · 79 marks · PDF
1.4 Pilot Surveys (Foundation)8p + answers · 59 marks · PDF
2.2 Recognising Misleading Graphs (Foundation)16p + answers · 82 marks · PDF
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