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A football club purchased footballs manufactured at three different factories in Chennai, Mumbai…
A football club purchased footballs manufactured at three different factories in Chennai, Mumbai and Delhi.
Given below is the data of the footballs manufactured at these factories during the same period:
- Chennai factory produced twice as many footballs as the Mumbai factory.
- The factory in Delhi manufactured the same number of footballs as that of the Mumbai factory.
Past records show that:
- $0.2\%$ of the footballs produced by factories at Chennai and Mumbai were defective.
- $0.4\%$ of the footballs manufactured at Delhi had defects.
A quality control team chose a football and found it to be defective.
What is the probability that it was produced in Mumbai factory?
Answer
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From ISC 2026 Improvement Mathematics Paper 1, question 10.