(Answered) The strength of wire produce by company a has mean 4500kg

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The strength of wire produce by company A has mean 4500kg and standard deviation of 200kg company B has a mean of 4000kg and a standard of 300kg A sample of 500 wires of company A and 100 wire of company B are selected at random for testing the strength Find 99 percent confidence interval on the different on the average strength of the population of the wire produce by two companies?

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