1MA0 Higher June 2014 Paper 2 Q20
20 25 students in class A did a science exam.
30 students in class B did the same science exam.
The mean mark for the 25 students in class A is 67.8
The mean mark for all the 55 students is 72.0
Work out the mean mark for the students in class B. (3)
| Answer | Mark | Notes |
|---|---|---|
| 75.5 | 3 | M1 for \(25 \times 67.8\) (= 1695) or \(55 \times 72.0\) (= 3960) M1 (dep) for \((\text{``}3960\text{''} - \text{``}1695\text{''}) \div 30\) A1 cao |