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O-LevelMathematicsProbability4024/22 · May/June 2020 · Q610 Marks

[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.

  1. (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.
  2. (a)(i)Find the probability that the two-digit number is less than 30.[1]
  3. (a)(ii)List all the possible two-digit numbers that are prime.[2]
  4. (a)(iii)Find the probability that the two-digit number is a multiple of 4.[2]
  5. (b)Rowan throws a dice 200 times. The bar chart shows his results. [Figure 6.2, Bar chart]
  6. (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]
  7. (b)(ii)Using Rowan's results, find the relative frequency that he threw a number less than 3.[2]
  8. (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]

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Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

  1. [1] (a)(i) 0.2 or 1/5 oe
  2. [2] (a)(ii) 23, 43, 53
  3. [2] B1 for three correct and one incorrect or for two correct and none incorrect
  4. [2] (a)(iii) 0.3 or 6/20 oe
  5. [2] B1 for 6/k where k is an integer > 6 or for 24, 32, 36, 52, 56 and 64 identified
  6. [1] (b)(i) 35, 22, 38
  7. [2] (b)(ii) 77/200 or 0.385
  8. [2] B1 for (46+31)/k where k is an integer > 77 or SC1 for 105/200 or 0.525
  9. [2] (b)(iii) Large sample
  10. [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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About this question

Topic
Probability, O-Level Mathematics (syllabus 4024). Structured question, 10 marks.
Source
O-Level Mathematics, May/June 2020 Paper 2 Variant 2, question 6.

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