4MA0 Higher June 2012 Paper 4 Q9
9 The table shows information about the snowfall in Ottawa in January one year.
| Snowfall (\(s\) cm) | Number of days |
|---|---|
| \(0 \leqslant s \lt 2\) | 19 |
| \(2 \leqslant s \lt 4\) | 8 |
| \(4 \leqslant s \lt 6\) | 3 |
| \(6 \leqslant s \lt 8\) | 0 |
| \(8 \leqslant s \lt 10\) | 1 |
Work out an estimate for the total snowfall in January.
(3)
| Scheme | Marks |
|---|---|
| (19 × 1)(=19) + (8 × 3)(=24) + (3 × 5)(=15) + (1 × 9) (=9) | M2 |
| 67 | A1 |
| (Total 3 marks) |
Notes
M2: for freq × all correct midpoint values correctly evaluated (condone omission of 4th interval)
{do not have to see intention to add}
if not M2 then M1 for freq × consistent point in each interval
or M1 for 1 error in list of 19, 24, 15, (0), 9
A1: isw if 67 calculated correctly. (2.16.. = M2A1)
Apart from questions 5, 7, 13c, 16b, 20, 21 and 22 (where the mark scheme states otherwise) the correct answer, unless clearly obtained by an incorrect method, should be taken to imply a correct method.