From an illuminating article about funeral arrangements:
Are caskets "one size fits all?"
The question mark should be outside the quotation mark in this case.
Question marks mixed with quotation marks can be tricky. If what you're quoting contains a question mark, then the question mark goes inside the quotation marks; if the entire sentence is a question, then the question mark goes outside.
Here are some correct examples:
Are caskets "one size fits all"?
"Do I look fat in this?" asked Mary.
Can you believe he called me "fat"?
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