From a book I'm reading:
"She wondered fleetingly how many thousands of people heard the same thing from their doctor every day?"
In this sentence, the question mark should be a period. Yes, the statement expresses a questioning thought, but the sentence itself isn't a question. It's the same as if you had a sentence starting "He exclaimed..." You wouldn't put an exclamation point at the end of the sentence. You would put a period.
So when you use the word "wonder," you don't use a question mark unless the whole sentence is a question, as is this:
"What? She wondered outloud about how big his biceps are?"
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