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) | 45.5 | 47.1 | 46.7 | 46.5 | 45.7 | 45.4 | 48.1 | 45.7 | 45.8 | 46.4 | 46.7 | 46.0 |
Find the standard deviation for these times.
Give your answer to 3 significant figures.
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.