Find the average and uncertainty of the length of the table?

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To find the average length of the table from two measurements, calculate the average of the two values a and c. The uncertainty should be determined by taking the larger of the two error values, b and d. This approach accounts for the imperfections in the table's measurements. The final average length will be expressed as the mean value with the larger uncertainty. This method ensures a more accurate representation of the table's length.
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I have two measurements for the length of a table (the table is not perfect so it is prudent to measure it on both sides). I get a +/- b and c +/- d as the measurements. Suppose b does not equal d. How can I find the average and uncertainty of the length of the table?
 
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Use the larger of the 2 error values.
 
The "average" is, of course, the average of the two a and c measurements. The uncertainty is, as Integral said, the larger of the two errors.
 

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