[Figure 6.1, Cards showing '5', '2', '4', '6', '3'] Two of these cards are chosen at random. They are placed next to each other to give a two-digit number.
- (a)[Figure 6.1, Cards showing '5', '2', '4', '6', '3'] Two of these cards are chosen at random. They are placed next to each other to give a two-digit number.
- (a)(i)Find the probability that the two-digit number is less than 30.[1]
- (a)(ii)List all the possible two-digit numbers that are prime.[2]
- (a)(iii)Find the probability that the two-digit number is a multiple of 4.[2]
- (b)Rowan throws a dice 200 times. The bar chart shows his results. [Figure 6.2, Bar chart]
- (b)(i)Use the bar chart to complete the table of results. [Table] Number on dice: 1, Frequency: 46. Number on dice: 2, Frequency: 31. Number on dice: 3, Frequency: 28. Number on dice: 4, Frequency: [blank]. Number on dice: 5, Frequency: [blank]. Number on dice: 6, Frequency: [blank].[1]
- (b)(ii)Using Rowan's results, find the relative frequency that he threw a number less than 3.[2]
- (b)(iii)Rowan says that the dice he has thrown is not a fair dice. Make two comments to explain why the dice may not be fair.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] (a)(i) 0.2 or 1/5 oe
- [2] (a)(ii) 23, 43, 53
- [2] B1 for three correct and one incorrect or for two correct and none incorrect
- [2] (a)(iii) 0.3 or 6/20 oe
- [2] B1 for 6/k where k is an integer > 6 or for 24, 32, 36, 52, 56 and 64 identified
- [1] (b)(i) 35, 22, 38
- [2] (b)(ii) 77/200 or 0.385
- [2] B1 for (46+31)/k where k is an integer > 77 or SC1 for 105/200 or 0.525
- [2] (b)(iii) Large sample
- [2] B1 46/200 is a lot bigger than 1/6 oe or 22/200 is a lot smaller than 1/6 oe
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