First, I assume in this question, supposedly you wanted to mention " 13 Female teaching assistant"
With that in mind, we have to find the total number of people in the mathematics department that is :
13+11+11+13= 48 total people
Now, find the probability (p) of a male professor which is:
Male professors: 13 People in total
Probability: Male professor/ total people
= 13/48
So, the probability of picking a male professor is: 13/48
Hope this helps.
