1MA0 Foundation June 2013 Paper 1 Q20
20 Ed has 4 cards.
There is a number on each card.
| 12 | 6 | 15 | ? |
The mean of the 4 numbers on Ed’s cards is 10
Work out the number on the 4th card. (3)
| Answer | Mark | Notes |
|---|---|---|
| 7 | 3 | M1 for 4 × 10 or 40 or \(\dfrac{12 + 6 + 15 + x}{4}\) or a correct equation M1 for a complete correct method A1 cao |