Final answer:
The observer should ADD if the first dropped digit is 5 or greater for upwards adjustment and DROP if it is less than 5 for downwards adjustment, based on rounding conventions.
Step-by-step explanation:
If the registration point is nearer the pair of rounds at the opposite end of the bracket (instead of the last round), the observer determines the range refinement to be ADD if the number to be dropped is 5 or greater, indicating that the measurement must be adjusted upwards.
Conversely, the observer should DROP if the first dropped digit is less than 5, implying that the measurement should be adjusted downwards. This principle is in accordance with the rules of rounding used in calculations where precision is crucial.
The rule for deciding whether to ADD or DROP is determined by the significance of the digit being removed from the measurement. For instance, if the last digit is a 6, the result would be rounded up. However, if the last digit is a 4, then the result is rounded down.
In this question, we are discussing the process of rounding. The observer is asked to determine the range refinement when the registration point is nearer the pair of rounds at the opposite end of the bracket instead of the last round. Range refinement refers to the rounding process where the final answer is adjusted based on the first dropped digit.
If the first dropped digit is 5 or greater, the observer will round up the final answer, and if the first dropped digit is less than 5, the observer will round down the final answer. This process ensures that the answer is rounded to an appropriate level of precision.