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Searching for the Morris DeGroot book recommended (Probability and Statistics), I have also encountered a book by a Marilyn DeGroot called Optimal Statistical Decisions.
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I think both are actually by Morris H. The one you want is at this Amazon page:
Probability and Statistics
You can probably find a used copy for much less at half.com, though you may have to settle for an earlier edition.
This is a college textbook. If you know basic calculus and are serious about this subject, it's a good choice.