There is a shelf in the library for the books by authors with the last names of Amster, Anderson, Axelson, Bannister, Baxter, and Bayer. The following table shows the number of books that the library has by these six authors and how many of those books are currently checked out. If Robert randomly selects one book from the remaining books on the shelf, what is
the probability that the author of the book he selects will be Baxter?