4MA0 Foundation January 2014 Paper 2 Q22
22 The mean of four numbers is 2.6
One of the four numbers is 5
Find the mean of the other three numbers.
(3)
| Scheme | Marks |
|---|---|
| 4 × 2.6 (= 10.4) | M1 |
| (4 × 2.6 − 5) ÷ 3 | M1 |
| 1.8 | A1 |
| (3) | |
| (Total 3 marks) |
Notes
M1: or 5.4 seen.
M1: Correct full calculation which would lead to correct answer.
A1: cao
Alternative solution
| Scheme | Marks |
|---|---|
| Any 4 numbers (including 5) that have a total 10.4 or any 3 numbers that have a total of 5.4 | M1 |
| (Sum of their 3 numbers) ÷ 3 | M1 |
| 1.8 | A1 |
Notes
M1: Correct full calculation which would lead to correct answer.