Higher November 2019 Paper 1 Q11
11 There are \(p\) counters in a bag.
12 of the counters are yellow.
Shafiq takes at random 30 counters from the bag.
5 of these 30 counters are yellow.
Work out an estimate for the value of \(p\). (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| 72 | M1 | for \(\dfrac{5}{30} = \dfrac{12}{p}\) oe, eg \(\dfrac{12}{p} \times 30 = 5\) or \(12 \div \dfrac{5}{30}\) or \(5 : 30 = 12 : p\) or 1 in 6 (\(30 \div 5\)) counters are yellow, so \(12 \times \text{``}6\text{''}\) or using equivalent ratios to \(5 : 30\), eg. \(2 : 12\) and \(10 : 60\) and adding to give \(2 + 10 : 12 + 60\) |
| A1 | cao |