Teesha is in french club. there are 10 freshman, 12 sophomores, 15 juniors, and 30 seniors in the club. the advisor is going to randomly choose one of the members of the club to be a guide for an important visitor.
1. 15/67
2. 22/67
3.37/67
4. 45/67

Let's first determine the total number of the students.
=> 10 freshman
=>12 sophomores
=>15 juniors
=> 30 seniors in the club. 
Since the adviser will only chose 1, let's add then divide by 4 to get the average.
=> 10 + 12 +15  + 30  = 67  students
=> 67 / 4 = 16.75
OR close to 
=> 15/67

Iam not sure , but probably 750 or 7.5