4MA0 Foundation June 2012 Paper 2 Q24
24 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 |
| (3) | |
| (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)