Answer:715 ways
Step-by-step explanation:
Given
There are 12 sophomores
8 Juniors 
and 13 seniors
Ms. bell create a 4- member committee  of seniors
No of ways of selecting 4 seniors out of 13 




So, there are 715 ways of forming a 4 member senior committee.
 
        
             
        
        
        
0.05 is the least among 0.5, 0.05, and 0.625
Hope that helps :)
        
             
        
        
        
Mean means u add then divide so it’s 80/10=8