The distance travelled by 100 people to an event is summarised below.
| Distance (nearest mile) | Frequency |
|---|---|
| 0 – 9 | 5 |
| 10 – 19 | 19 |
| 20 – 29 | 40 |
| 30 – 39 | 27 |
| 40 – 49 | 8 |
| 50 – 59 | 1 |
You may use: ∑fx=2620\sum fx = 2620∑fx=2620 and ∑fx2=79055\sum fx^2 = 79055∑fx2=79055
Estimate the standard deviation.
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.