Foundation November 2019 Paper 3 Q10
10 Nada is planning the colour scheme for her bedroom.
The colour of her carpet can be blue (B), grey (G) or red (R).
The walls can be painted yellow (Y), white (W) or pink (P).
(a) Complete the table to show all of the possible colour combinations she can make.
You may not need all the rows.
You may not need all the rows.
| Carpet | Walls |
|---|---|
| B | Y |
[2]
(b) Explain why it would not be mathematically correct to find the probability that Nada decides on a grey carpet and pink walls using this formula.\[\frac{1}{\text{the total number of colour combinations}}\]
[1]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| [BY] GY RY BW GW RW BP GP RP | 2 | B1 for 6 or more correct with repeats and/or errors or B1 for 4 to 7 correct with no repeats and/or errors | Number does not include BY Mark only the contents of the table unless clearly a restart or table continued |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| Not a random choice oe | 1 | Accept explanations suggesting unequal / not random EG Grey and pink do not match and so less likely to be used; she may not like the colours and so won’t choose them, it’s a decision… | Anything suggesting she may have a preference or that colours would not “go together” |