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9 The lifetimes of the 60 watt light bulbs produced by the Lucifine Company are...

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Algebra

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9 The lifetimes of the 60 watt light bulbs produced by the Lucifine Company are distributed randomly with an average lifetime of 560 hours The percentage of bulbs with lifetimes of x hours or less is approximately modeled by 100 f x 1 e 0 04 x 560 The production manager wishes to find the time x that equals or exceeds the lifetime of 68 of the bulbs Solve for this time Round to the nearest hour 10 An initial investment of 2000 doubles in value in 8 1 years Assuming continuous compounding what was the interest rate Round to the nearest tenth of a percent

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