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このデータをうまく活用して、何かできないかな。
This sentence is from Wanikani, and it's translated as "I don’t know if I can put this data to good use." I understand the first part of the sentence, but I don't know why 何かできないかな is translated, or has the meaning of "I don't know." Is it a set phrase?
かな is added to add some kind of uncertainty to the sentence, to show that you are unsure. It is often a way of asking someone else for confirmation.
To make a more literal translation I would thus say:
I wonder if something can't be done, to put this data to good use
