4MA0 Foundation June 2015 Paper 1 Q24
24 There are 32 students in Mr Newton’s class.
20 are boys and 12 are girls.
The mean height of the boys is 151 cm.
The mean height of the girls is 148 cm.
Calculate the mean height of all the students in Mr Newton’s class.
(3)
| Scheme | Marks |
|---|---|
| 20 × 151 (= 3020) or 12 × 148 = (1776) or 4796 | M1 |
| (“3020” + “1776”) ÷ (12 + 20) or (“3020” + “1776”) ÷ 32 | M1 |
| 149.875 | A1 |
| (3) | |
| Total 3 marks |
Notes
M1: dep
A1: for 149.875 rounded or truncated to 1 or more decimal places
Accept 150 if M2 awarded