The times 12 athletes took to run 400m is summarised in the table below.
| Athlete | A | B | C | D | E | F | G | H | I | J | K | L |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Time (s) | 45.2 | 46.9 | 46.1 | 46.2 | 45.4 | 45.1 | 48.0 | 45.4 | 45.5 | 46.1 | 46.4 | 45.7 |
Verify that the mean time taken is 46.0.
Verify that the standard deviation for these times is 0.793.
Verify that the median is 45.9, the upper quartile is 46.3 and the lower quartile is 45.4 for these data.
96 exam-style questions on Edexcel A Level Maths Measures of Location and Spread, covering 2.1 Measures of Central Tendency, 2.2 Other Measures of Location, 2.3 Measures of Spread, 2.4 Variance and Standard Deviation, and 2.5 Coding. Each one has a worked solution and a mark scheme showing where the marks go.