4MA0 Higher June 2014 Paper 4 Q2
2 Sarah has a biased 4-sided spinner.
The spinner can land on 1, 2, 3 or 4
The probability that the spinner will land on 1, 2 or 4 is given in the table.
| Number | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Probability | 0.4 | 0.35 | 0.1 |
(a) Work out the probability that the spinner will land on 3 (2)
Ryan is going to spin the spinner 80 times.
(b) Work out an estimate for the number of times he should expect the spinner to land on 2 (2)
| Scheme | Marks |
|---|---|
| 1 – (0.4 + 0.35 + 0.1) | M1 |
| 0.15 oe | A1 |
| (2) |
Notes
A1: Accept as a decimal, fraction or percentage
| Scheme | Marks |
|---|---|
| 80 × 0.35 oe | M1 |
| 28 | A1 |
| (2) | |
| (4 marks) |
Notes
A1: NB. \(\dfrac{28}{80}\) oe gains M1 A0