A test was given to a group of students. The grades and gender are summarized below

A B C Total
Male 17 15 10 42
Female 20 11 9 40
Total 37 26 19 82


If one student is chosen at random from those who took the test,

Find the probability that the student was female GIVEN they got a 'C'.
Give answer as a reduced fraction or decimal rounded to 3 decimal places.