Answer:
10/17 or 58.82352941% or 58.82%
Explanation:
Amount of students studying Biology: 3
Amount of students studying Art: 17
Amount of students studying both: 10
Amount of students studying neither: 7
There are 17 students studying art.
Therefore, there are 17 students that can be randomly selected.
There are 10 students studying both.
The probability is 10/17 or 58.82352941% or 58.82%.