In a certain Algebra and Trigonometry class, there are 10 male freshmen, 7 female freshmen, 6 male sophomores, and 4 female sophomores. If a person is selected randomly from the group, find the probability that the selected person is a freshman or female.(Type an integer or a simplified fraction.)
In total, there are 10 + 7 + 6 + 4 = <<10+7+6+4=27>>27 students.
There are 7 female freshmen, so the probability of selecting a female freshman is 7/27.
There are 10 male freshmen, so the probability of selecting a male freshman is 10/27.
Therefore, the probability of selecting a freshman or female is (7/27) + (10/27) = 17/27. Answer: \boxed{\frac{17}{27}}.