Given:
Uniform distribution of length of classes between 45.0 to 55.0 minutes. 
To determine the probability of selecting a class that runs between 51.5 to 51.75 minutes, find the median of the given upper and lower limit first:
45+55/2 = 50
So the highest number of instances is 50-minute class. If the probability of 50 is 0.5, then the probability of length of class between 51.5 to 51.75 minutes is near 0.5, approximately 0.45. <span />
        
             
        
        
        
Answer:
Last one
Step-by-step explanation:
 
        
                    
             
        
        
        
100,000 30,000 7,000 
the first one i believe
        
             
        
        
        
The answer is 5 because 10 divided by 2 is 5