Answer:
Data can be useful but not usable
Data can be usable but not useful
Step-by-step explanation:
It is important to note that not all data that is useful is always usable. For example, you may want to calculate the mean of the math scores of student in a class, but you have the data for the age of all the students in the class, while this data might be useful, it is not usable for the purpose you want at that moment. Also, not all data that is usable is useful. However data can be useful but not usable, and data can be usable, but not useful.