Final answer:
The reasonable value of the range for the number of hours studied for an exam is 1.
Step-by-step explanation:
In statistics, the range is defined as the difference between the maximum and minimum values in a set of data. In this case, the question is asking for a reasonable value of the range in relation to the number of hours studied for an exam. Since the range represents the spread of the data, it is not appropriate to have a negative value for the range. Therefore, option A (-8) can be eliminated.
Option B (1.75) is not a reasonable value for the range because studying for an exam is typically measured in whole numbers and not in fractions.
Option C (1/6) is also a fraction and not a reasonable value for the range.
Option D (70) is too large of a value for the range, especially when considering the context of studying for an exam.
Based on these considerations, the most reasonable value for the range would be 1, as it represents a small spread of hours studied.