1MA0 Higher June 2013 Paper 2 Q21
21 In Holborn School there are
460 students in Key Stage 3
320 students in Key Stage 4
165 students in Key Stage 5
Nimer is carrying out a survey.
He needs a sample of 100 students stratified by Key Stage.
Work out the number of students from Key Stage 3 there should be in the sample. (2)
| Answer | Mark | Notes |
|---|---|---|
| 48 or 49 | 2 | M1 for \(\dfrac{460}{460 + 320 + 165} \times 100\) (=48.67 ….) or \(\dfrac{460}{9.5}\) or \(\dfrac{460}{9.45}\) A1 for 48 or 49 |