Answer: 19/37 or 21/37
Step-by-step explanation:
6 + 12+ 10+9= 37
There are 10 male teaching assistants and 9 female teaching assistants so in total there are 19 teachings assistants.
so the probability that a selected person is a teaching assistant is 19/37
or if they are female it will be 12 + 9 because there are 12 female professors and 9 female teaching assistants.
12+9= 21/37