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O-LevelMathematicsProbability4024/12 · May/June 2019 · Q52 Marks

Lamps are made in a factory. A random sample of 50 of the lamps is tested and 4 of them are found to be faulty. A total of 4000 lamps is made in one day. Calculate the number of these 4000 lamps you would expect to be faulty.

  1. Calculate the number of these 4000 lamps you would expect to be faulty.[2]

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

  1. [2] 320
  2. [M1] for 4/50 x 4000 oe isw

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About this question

Topic
Probability, O-Level Mathematics (syllabus 4024). Structured question, 2 marks.
Source
O-Level Mathematics, May/June 2019 Paper 1 Variant 2, question 5.

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