Foundation November 2018 Unit 2 Q3
3. Here are 9 numbers:
27 19 20 32 21 29 20 24 33
(a) Find the mean of these numbers. [3]
(b) Neil says,
“To find the median, you just choose the middle number in the list.
The median of these numbers is 21.”
Neil’s median is incorrect.
Explain what is wrong with Neil’s method. [1]
“To find the median, you just choose the middle number in the list.
The median of these numbers is 21.”
Neil’s median is incorrect.
Explain what is wrong with Neil’s method. [1]
| Scheme | Marks | Comments |
|---|---|---|
| Sum of numbers (225) | M1 | Allow for an unsupported value between 192 and 258 inclusive. |
| Sum of numbers / 9 | m1 | Award this m1 for ‘their sum’ ÷ 9 |
| 25 | A1 | CAO |
| Scheme | Marks | Comments |
|---|---|---|
| Correct explanation e.g. Neil hasn’t written the numbers in (ascending or descending) order. | E1 |