Final answer:
Claudine Soosay's average time for assembling a watch cannot be computed without her specific recorded times. For the stopwatches with an uncertainty of ±0.05s, this uncertainty could impact conclusions in close races. Time calculations for the provided examples are straightforward additions.
Step-by-step explanation:
To calculate Claudine Soosay's average time for assembling a watch with a performance rating of 85%, we would need the actual times of her attempts. Since these are not provided in the question, I cannot compute an average time. However, I can help explain how this would normally be done. You would add all the recorded times together and divide by the number of attempts to find the average. If the performance rating is used to adjust the time, we would take this average time and divide it by the performance rating percentage to find the time that represents normal performance.
Regarding the stopwatch with an uncertainty of ±0.05 seconds, when the sprinter's times are very close, such as 12.04 seconds and 11.96 seconds, the uncertainty means that these times can overlap when considering the potential error. This uncertainty could make it difficult to conclude definitively that one week was faster than the other.
For the additions of units of time:
- 15 minutes + 60 minutes = 75 minutes,
- 10 minutes + 20 minutes = 30 minutes,
- 15 seconds + 45 seconds = 60 seconds or 1 minute.
For the track meet with times of 12.04 seconds and 12.07 seconds, even a small uncertainty can matter a lot in close races. Therefore, the new stopwatch may not be helpful if its uncertainty affects the outcome of the race.