Day | Clock 1 | Clock 2 |
Monday | \[\text{12}:00:0\text{5}\] | \[\text{1}0:\text{15}:0\text{6}\] |
Tuesday | \[\text{12}:0\text{1}:\text{15}\] | \[\text{1}0:\text{14}:\text{59}\] |
Wednesday | \[\text{11}:\text{59}:0\text{8}\] | \[\text{1}0:\text{15}:\text{18}\] |
Thursday | \[\text{12}:0\text{1}:\text{5}0\] | \[\text{1}0:\text{15}:0\text{7}\] |
Friday | \[\text{11}:\text{59}:\text{15}\] | \[\text{1}0:\text{14}:\text{53}\] |
Saturday | \[\text{12}:0\text{1}:\text{3}0\] | \[\text{1}0:\text{15}:\text{24}\] |
Sunday | \[\text{12}:0\text{1}:\text{19}\] | \[\text{1}0:\text{15}:\text{11}\] |
Answer:
The range of variation over the seven days of observations is 162 s for clock 1, and 31s for clock 2. The average reading of clock 1 is much closer to the standard time than the average reading of clock 2. The important point is that a clock's zero error is not as significant for precision work as its variation, because a 'zero-error' can always be easily corrected. Hence clock 2 is to be preferred to clock 1.
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