Two clocks are being tested against a standard clock, the readings of

1.	Two clocks are being tested against a standard clock, the readings of the two clocks are
Answer» The range of variation over the seven days of observation is 162 s for clock 1, and 31 s 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 closk 2 is to be preferred to clock 1.

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