Given the time displayed on the stopwatch, the digit with the least amount of confidence is given by the least value in the time displayed on the stop watch which is the tenth digit of the second count. Hence, the digit with the least amount of confidence is 7 and the measurement is displayed to 4 significant figures.
- The time displayed on the stopwatch is 0:13:37 with 0 being the hour count ; 13 the minute count and 37 being the second count.
- The least digit in the measurement is the tenth value of the second count which is 7.
- The number of significant figures is counted by ignoring the value of 0 representing the hour count, Hence, we have 13:37; which gives a four significant figures.
Therefore, the measurement is represents 4 significant figures.
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