Answer:
0.323
Step-by-step explanation:
Number of mathematics instructors=8
Number of Computer Science instructors=13
Number of Statistics instructors=4
Number of Physics instructors=6
Total Attendance = 8+13+4+6=31
Probability of Getting a Physics Instructor=6/31
Probability of Getting a Statistics Instructor=4/31
Pr (Getting a Physics OR Statistics Instructor)
=Probability of Getting a Physics Instructor+
Probability of Getting a Statistics Instructor
=6/31+4/31=10/31=0.323
