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Question No 4 Timer: 01:22 Mark: 2 An electrical firm manufactures light bulbs that are known to have a population standard deviation of 40

Question No 4 Timer: 01:22 Mark: 2 An electrical firm manufactures light bulbs that are known to have a population standard deviation of 40 hours. A sample of 49 bulbs is found to have an average life span of 780 hours. Find a 99% confidence lower bound for the population mean

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