4400 Higher November 2009 Paper 3 Q4
4 In a survey of 36 families, the number of people in each family was recorded.
The table shows the results.
| Number of people in the family | Frequency |
|---|---|
| 1 | 3 |
| 2 | 2 |
| 3 | 7 |
| 4 | 13 |
| 5 | 11 |
Work out the mean number of people in these 36 families.
(3)
| Scheme | Marks |
|---|---|
| (1 × 3) + (2 × 2) + (3 × 7) + (4 × 13) + (5 × 11) | M1 |
| “135” ÷ 36 | M1 (dep) |
| 3.75 | A1 |
| (3) | |
| (3 marks) |
Notes
M1: must see at least 3 correct products
A1: accept 4 with working