Line XY was measured by four parties A, B, C, D. Each party has two measurements as follows: Trial A B C D 1 91.25 91.21 91.20 91.18 2 91.19 91.27 91.22 91.26 a. Find the precision of each party and which has the highest precision. b. What is the most probable length of XY?
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Line XY was measured by four parties A, B, C, D. Each party has two measurements as follows:
| Trial | A | B | C | D |
| 1 | 91.25 | 91.21 | 91.20 | 91.18 |
| 2 | 91.19 | 91.27 | 91.22 | 91.26 |
a. Find the precision of each party and which has the highest precision.
b. What is the most probable length of XY?
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