Question: Suppose that 21 observations are taken at random from an exponential distribution for which the mean is unknown ( > 0), the average of

Suppose that 21 observations are taken at random from an exponential distribution for which the mean μ is unknown (μ > 0), the average of 20 of these observations is 6, and although the exact value of the other observation could not be determined, it was known to be greater than 15. Determine the M.L.E. of μ.

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