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Final answer:The quantity that is being estimated in a study aimed at determining the mean base circumference of maple trees in a forest is denoted by the Greek letter mu (μ), which represents the population mean.Explanation:The quantity being estimated through a random sample of maple trees to find the mean base circumference of all maple trees in a forest is represented by the notationμ, which is the Greek letter mu. This symbolμrepresents the population mean, a parameter that is typically unknown and is estimated through the use of sample data. Since the base circumference of maple trees in a forest is a continuous random variable, the estimator would aim to provide an accurate estimate of this mean, which would, in turn, give insights into the average size of maple trees within the entire forest....