Intermediate November 2023 Unit 2 Q2
2.
(a) A pencil case contains some pens.
One pen is chosen at random.
The probability that the chosen pen is blue is 45%.
What is the probability that the chosen pen is not blue? [1]
One pen is chosen at random.
The probability that the chosen pen is blue is 45%.
What is the probability that the chosen pen is not blue? [1]
(b) Dewi throws a fair six-sided dice.
What is the probability that Dewi throws a prime number?
Circle your answer. [1]
What is the probability that Dewi throws a prime number?
Circle your answer. [1]
\(\dfrac{1}{6}\) \(\dfrac{1}{2}\) \(\dfrac{5}{6}\) \(\dfrac{1}{3}\) \(\dfrac{2}{3}\)
| Scheme | Marks | Comments |
|---|---|---|
| 55% or 0·55 or \(\dfrac{55}{100}\) or \(\dfrac{11}{20}\) or equivalent | B1 | Allow 55. Do not accept 0·55%. |
| Scheme | Marks | Comments |
|---|---|---|
| \(\dfrac{1}{2}\) | B1 |