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Based on the survey data, 3 out of 80 patrons borrow novels when they visit the library.
To estimate the number of patrons who borrow novels when the library has 345 patrons, we can set up a proportion:
3 novels out of 80 patrons = x novels out of 345 patrons
(3/80) = (x/345)
Cross multiplying:
80x = 3 * 345
80x = 1035
x = 1035 / 80
x ≈ 12.94
Therefore, approximately 13 patrons borrow novels when the library has 345 patrons.