Question: The difference in elevation between two ground points was measured by each of the three field parties using different kinds of leveling instruments. The results

The difference in elevation between two ground points was measured by each of the three field parties using different kinds of leveling instruments. The results are as follows: 1st Party, DE = 18.45 m ± 0.05 m; 2nd Party, DE=18.40 m ± 0.04 m; 3rd Party, DE = 18.48 m ± 0.05m. Determine the most probable difference in elevation between the two ground points.

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