A line of levels was run from benchmarks A to B, B to C, and C to D. The elevati

Question

A line of levels was run from benchmarks A to B, B to C, and C to D. The elevation differences obtained between benchmarks, with their standard deviations, are listed below. What is the difference in elevation from benchmark A to D and the standard deviation of that elevation difference? BM A to BM B = +34.65 plusminus 0.10 ft; BM B to BM C = -48.23 plusminus 0.08 ft; and BM C to BM D = -54.90 plusminus 0.09 ft BMA to BM B = +27.823 plusminus 0.015 m; BMB to BMC = +15.620 plusminus 0.008 m; and BM C to BM D = +33.210 plusminus 0.011 m BMA to BM B = -32.688 plusminus 0.015 m; BM B to BM C = +5.349 plusminus 0.022 m; and BM C to BM D = -15.608 plusminus 0.006 m

Explanation / Answer

b

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