Foundation November 2018 Paper 1 Q10
10.
(a)
There are 10 marbles in a bag.
The table shows the number of marbles of each colour.
| Red | Green | Blue | Pink |
|---|---|---|---|
| 4 | 3 | 1 | 2 |
Meena takes a marble from the bag without looking.
(i) Complete this statement with a colour.
The probability that Meena takes a ………… marble is \(\frac{1}{5}\). [1]
The probability that Meena takes a ………… marble is \(\frac{1}{5}\). [1]
(ii) Write down the probability that Meena takes a yellow marble. [1]
(iii) Work out the probability that Meena does not take a red or green marble. [2]
(b)
Netta has a tub containing 12 white tennis balls and 8 green tennis balls.
She puts some more green tennis balls into the same tub.
She then chooses a tennis ball at random from the tub.
The probability that Netta picks a white tennis ball is \(\frac{2}{5}\).
How many more green tennis balls did Netta put in the tub? [2]
| Scheme | Marks | Comments |
|---|---|---|
| (i) Pink | B1 | |
| (ii) 0 | B1 | Accept zero or nil etc; do not accept none or impossible etc |
| (iii) \(\frac{3}{10}\) or equivalent | B2 | B1 for [1 –] \(\frac{4+3}{10}\) or for a numerator of 3 |
| Scheme | Marks | Comments |
|---|---|---|
| 10 | B2 | B1 for 30 or for \(\frac{12}{30}\) seen or for 18 seen |
| (6) |