In site 4, the first and last years are both NA's. Come up with some variation on the left-hand or right-hand estimate to estimate the total number of aspen.
Biologists measure the number of aspen that germinate in four sites over eight years, but can only measure two sites per year. In the following table, NA indicates that no measurement was made in that year. In each case, compare the estimate with twice the number that germinated in the four years studied. Why are they different?

The goal is to estimate the total number of aspen that germinated in each of the four sites during all eight years.

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Year Site 1 Site 2 Site 3 Site 4 1990 12 1991 NA NA 34 1992 16 NA NA 15 1993 17 2 NA NA 1994 NA NA 40 1995 NA 23 1996 NA 27 1997 13 NA 37NA 23 NA NA 10 18 31 NA NA