4MA0 Higher January 2013 Paper 4 Q3
3 The table shows information about the marks of 20 students in a science test.
| Mark | Frequency |
|---|---|
| 6 | 2 |
| 7 | 4 |
| 8 | 5 |
| 9 | 8 |
| 10 | 1 |
Work out the mean mark of the 20 students.
(3)
| Scheme | Marks |
|---|---|
| 6×2 + 7×4 + 8×5 + 9×8 + 10×1 or 12 + 28 + 40 + 72 + 10 or 162 | M1 |
| “162” ÷ 20 | M1 |
| 8.1 | A1 |
| (3) |
Notes
M1: for at least 3 correct products and summing them
M1: (dep) for division by 20
A1: Accept 8 if 162 ÷ 20 seen
NB: Award A0 if 8.1 clearly comes from incorrect figures