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Suppose that the lifelengths (in thousands of hours) of light bulbs are distributed…

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Suppose that the lifelengths (in thousands of hours) of light bulbs are distributed Exponential(θ), where A 0 is unknown. If we observe x- = 5.2 for a sample of 20 light bulbs, record a representative likelihood function. Why is it that  t we only need to observe the sample average to obtain a representative likelihood?