Foundation June 2024 Paper 2 Q13
13 Four numbers have a mean of 10
Three of the numbers are 5 8 9
Work out the other number. [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| Alternative method 1: find total | ||
| \(4 \times 10\) or 40 | M1 | oe |
| their \(40 - 5 - 8 - 9\) | M1 | oe their 40 must be greater than 22 |
| 18 | A1 | |
| Alternative method 2: trial and improvement | ||
| One trial evaluated correctly | M1 | eg trials 12, \(\dfrac{5 + 8 + 9 + 12}{4} = 8.5\) |
| The correct trial evaluated correctly | M1dep | |
| 18 | A1 | |
Additional guidance
| Embedded 18 without being selected as answer | M2A0 |