Higher June 2017 Paper 3 Q5
5 A coin lands on Tails 200 times.
The relative frequency of Tails is 0.4
Work out the number of times the coin was thrown. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(200 \div 0.4\) or \(200 \div 40 \times 100\) or \(200 = 0.4 \times n\) | M1 | oe (Heads =) 300 200 : 300 |
| 500 | A1 |
Additional guidance
| Build up method must be complete | |
| eg 200 = 40%, 100 = 20%, 500 (= 100%) | M1A1 |
| 200 = 40%, 100 = 20%, 400 = 80%, 100 + 400 | M1A0 |
| 200 = 40%, 100 = 20%, 400 = 80% | M0A0 |
| 0.4 : 0.6 = 200 : 300 | M1A0 |
| 100 = 20%, 300 = 60% | M1A0 |
| \(200 \div 0.4 = 500,\ 500 + 200 = 700\) incorrect method | M0A0 |