Data taken from a sample of 25 LED lamps, a sample average of 2 years was obtained and a standard deviation of s=0.4 yea

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answerhappygod
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Data taken from a sample of 25 LED lamps, a sample average of 2 years was obtained and a standard deviation of s=0.4 yea

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Data taken from a sample of 25 LED lamps, a sample average of 2years was obtained and a standard deviation of s=0.4 years. Theestimator of the mean of lifetime of LED lamps at the confidencelevel/coefficient (1-α) is
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