The scores of 12 students in a quiz are summarised in the table below.
| Student | A | B | C | D | E | F | G | H | I | J | K | L |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Score | 68 | 74 | 71 | 69 | 73 | 70 | 72 | 67 | 75 | 71 | 69 | 70 |
Find the mean score.
Find the standard deviation for these scores.
Find the median, upper and lower quartiles of these data.
32 exam-style questions on Edexcel AS 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.