The probability that a light bulb produced by a factory is faulty is 0.04
A batch of 500 light bulbs is checked.
Work out an estimate for the number of faulty light bulbs in the batch.
Practise OCR GCSE Maths Probability with exam-style questions for Foundation and Higher tier. 100 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.