4400 Higher November 2010 Paper 3 Q1
1 The table shows information about the numbers of children in 25 families.
| Number of children in the family | Frequency |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 8 |
| 4 | 0 |
| 5 | 4 |
Work out the mean number of children in these 25 families.
(3)
| Scheme | Marks |
|---|---|
| 1 × 4 + 2 × 9 + 3 × 8 + 5 × 4 (= 66) | M1 |
| “66” ÷ (4 + 9 + 8 + 4) | M1 |
| 2.64 | A1 |
| (3) | |
| (3 marks) |
Notes
M1: Any 3 correct products with the intention to add
M1: dep
A1: allow 3 with working
3 without working = M0M0A0
2.6 without working = M2 A0