The table shows the reaction times of participants in a study.
| Reaction time (ms) | 200–<300 | 300–<400 | 400–<500 | 500–<600 |
|---|---|---|---|---|
| Frequency | 3 | 8 | 7 | 2 |
Calculate the percentage of participants with reaction times below 400 ms.
72 exam-style questions on Edexcel GCSE Psychology 11.2 Data analysis, covering 11.2.1 Arithmetic and numerical computation, 11.2.2 Descriptive statistics, 11.2.3 Tables, charts and graphs, 11.2.4 Primary and secondary data, and 11.2.5 Qualitative and quantitative data. Each one has a worked solution and a mark scheme showing where the marks go.