Two clocks are being tested against a standard clock located in a national laboratory. At 12:00:00 noon by the standard clock, the readings of the two clocks are :
`{:(,"Clock1", "Clock 2"),("Monday",12:00:05:,10:15:06),("Tuesday",12:01:15,10:14:18),("Wednesday",11:59:08,10:15:18),("Thursday",12:01:50,10:15:07),("Friday",11:59:15,10:14:53),("Saturday",12:01:30,10:15:24),("Sunday",12:01:19,10:15:11), ("Sunday",12:01:19,10:15:11):}`
If you are doing an experiment that requires precision time interval measurements, which of the two clocks will you prefer? The range of variation in time of clock ?

Explanation

The range of vartiation in the time of clock -1
`(overset(12:01:50) (11:59:08))/(00:12:42)`
`:.120+42=162` seconds
The range variation in time of clock -2
`(overset (10:15:24) (11:59:08))/(00:00:31)`
Standard time is `12:00:00`
The average time of clock - 1 is nearby standard time. Whereas the average time of clock - 2 is very far from standard time. So, there is a zero error in clock - 2. The important point is that a clock.s zero error is not as significant for precision work as its variation, because zero error can always be easily corrected. The variation of measurement of time in clock-lis 162 s and that of clock - 2 is 31 s. That clock is very perfect in which the variation is very less. In that manner, we have to select clock - 2 for time measurement (measurement of time)