Higher November 2022 Paper 4 Q4
4 A phone manufacturer records the faults that are reported.
Last week, in a batch of 96 phones, 6 were reported as faulty.
(a) Write down the relative frequency of faulty phones in this batch. [1]
(b) In 2020, the manufacturer sold a total of 12 321 phones.
Work out how many of these phones the manufacturer should expect to be reported as faulty. [2]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| [0].0625 or \(\frac{6}{96}\) oe or 6.25% | 1 | e.g. \(\frac{1}{16}\) but not in words or as a ratio | |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 770 | 2 | FT their (a) for 2 marks, answer must be an integer M1 for 12 321 × their [0].0625 or 12 320 × their [0].0625 | condone 771 as answer. M1 implied by 770.06… or 770.1 |