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25. A manufacturer offers a 3-year warranty on its vacuum cleaners. The vacuum cleaners have a mean lifespan of 4.5 years, with a standard

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25. A manufacturer offers a 3-year warranty on its vacuum cleaners. The vacuum cleaners have a mean lifespan of 4.5 years, with a standard deviation of 0.5 years. (3 marks) a. Determine the percentage of vacuum cleaners they would have to fix. b. If the company sold 100 000 vacuum cleaners how many would the company need to repair under warranty?

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