A. 7.1 b.idk sorry    c.74,160
        
             
        
        
        
A: High School P, because it has the lowest <span>σ
B: High School N, because it has the highest mean</span>
        
                    
             
        
        
        
Answer: A = 20
How to Solve:
Just by looking at this problem I can tell that the denominators (9 an 45) are factors of 9. So the second equation is multiplied by 5 from the first equation.
4/9 x 5 
4 x 5 = 20
— -—
9 x 5 = 45
So A would be 20.
Another way to solve this would be by multiplying the 1st equations numerator with the second equations denominator: 
4 x 45 = 180
Then divide 180 with the 1st equation’s denominator. 
180 / 9 = 20
A = 20
        
             
        
        
        
Answer: This sample may be biased because he is only asking the bike riders when in reality there might be a majority of students who instead take an alternate form of transportation
Step-by-step explanation:
 
        
             
        
        
        
Answer:
36
Step-by-step explanation:
Since E is the midpoint, AE and EB are equal. We can write this as such, 
4x+6=10x-12 if we solve from here we get 6x=18. Simplify to get x=3. sub in three for  x in the AE equation, 4(3)+6 and solve. You'd get 18 as your answer. Double that to get the solution since AE= 1/2AB. 18*2= 36
AB=36