Question

what is the meaning of ballpark figure?
asked for an estimate, the mayor provided a ballpark figure for the cost of expanding the hampton public library.
a rough estimate for an amount
a person attending a sports event
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Explanation:

The phrase "ballpark figure" is an idiomatic expression. In the context of the sentence, the mayor was asked for an estimate (of the cost of expanding the library). An idiomatic meaning that relates to giving an estimate is needed. "A rough estimate for an amount" fits this context as it implies an approximate value. "A person attending a sports event" is a literal interpretation of "ballpark" (a place for sports like baseball) but does not fit the idiomatic use in the given sentence.

Answer:

a rough estimate for an amount