Numeracy Intermediate November 2020 Unit 2 Q5
5. Each week in Ysgol Derwen, the headteacher calculates the mean attendance for each class.
This is the mean number of half-days per week that students have attended school from Monday to Friday.
There are 5 classes in Year 11.
The headteacher has partially completed a table recording Week 1 attendance for each class in Year 11, as shown below.
| Class | Number of pupils | Total number of half-days attended in Week 1 | Mean attendance for the 10 half-days in Week 1 |
|---|---|---|---|
| 11A | 28 | 238 | 8·5 |
| 11B | 25 | …………… | 7·4 |
| 11C | 32 | …………… | 9·5 |
| 11D | 30 | 270 | 9·0 |
| 11E | 25 | …………… | 6·6 |
| Total | …………… | …………… |
Complete the table.
Hence calculate the overall mean attendance for all of Year 11 in Week 1 at Ysgol Derwen.
You must show all your working. [3]
Overall mean attendance for all of Year 11 is ……………
| Scheme | Marks | Comments |
|---|---|---|
| Total number of half-days 185, 304 and 165 AND total number of pupils in Year 11 is 140 | B1 | |
| (238 + 185 + 304 + 270 + 165) ÷ 140 or 1162 ÷ 140 | M1 | FT ‘ their total of number of half days’ ÷ ‘their 140’ |
| 8.3 (half-days) | A1 | Must be from a correct evaluated total for ‘their entries for the number of half days’ ISW |