A company claims that the mean lifetimes of the semiconductors it produces is at least 25 hours.

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A company claims that the mean lifetimes of the semiconductors it produces is at least 25 hours. To substantiate this claim, an independent testing service has decided to sequentially test, one at a time, the company’s semiconductors for 600 hours. If 30 semiconductors failed during this period, what can we say about the validity of the company’s claim? Test at the 10 percent level.

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