1MA0 Foundation June 2012 Paper 1 Q20
20 The stem and leaf diagram shows some information about the speeds of 25 cars.
| 2 | 9 |
| 3 | 1 3 5 6 7 8 8 9 |
| 4 | 2 3 3 4 5 6 8 8 9 9 |
| 5 | 1 2 4 5 6 |
| 6 | 0 |
Key: 2 | 9 means 29 miles per hour
(a) How many of the 25 cars had a speed of more than 50 miles per hour? (1)
(b) Find the median speed.
miles per hour (1)
miles per hour (1)
(c) Work out the range of the speeds.
miles per hour (2)
miles per hour (2)
| Answer | Mark | Notes |
|---|---|---|
| 6 | 1 | B1 cao |
| Answer | Mark | Notes |
|---|---|---|
| 44 | 1 | B1 cao |
| Answer | Mark | Notes |
|---|---|---|
| 31 | 2 | M1 for \(60 - 29\) or \(29 - 60\) or any correct method that is attempting to find the difference between 29 and 60 (allow 1 arithmetic error) A1 cao |