Study the given table and answer the question that follows.
The table shows staff readings observed in a reciprocal levelling conducted between two stations X and Y.
|
Instrument at |
Staff Readings |
|
|
X |
Y |
|
|
X |
2.230 m |
3.550 m |
|
Y |
0.910 m |
2.240 m |
Calculate the true difference in elevation between two points X and Y.
1
1.725 m
2
1.325 m
3
0.965 m
4
2.015 m