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Out of a consignment of 1,00,000 tennis balls 496 were selected at random and examined and it was found that 20 of these were defective.

  1. Out of a consignment of 1,00,000 tennis balls 496 were selected at random and examined and it was found that 20 of these were defective. How many defective balls can you reasonably expect to have in the whole consignment at 95 per cent confidence level?

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