Answer:
a
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:

If we compare this value with the 47.3 proposed we have the following error

The computed mean is close to the actual mean because the difference between the means is less than 5%.  
Step-by-step explanation:
Assuming the following dataset:
Speed   42-45  46-49  50-53  54-57  58-61
Freq.         21        15        6           4          2
And we are interested in find the mean, since we have grouped data the formula for the mean is given by:

And is useful construct a table like this one:
Speed     Freq    Midpoint   Freq*Midpoint
42-45       21            43.5       913.5
46-49       15            47.5        712.5
50-53       6             51.5         309
54-57        4            55.5         222
58-61        2             59.5        119
Total       48                           2276
And the mean is given by:

If we compare this value with the 47.3 proposed we have the following error

The computed mean is close to the actual mean because the difference between the means is less than 5%.  
 
        
             
        
        
        
Answer:
B and F
Step-by-step explanation:
The fourth quadrant contains a positive number for the x axis and a negative number for the y axis. (B=4,-5 and F=4,-7)
 
        
             
        
        
        
Answer:
Solve:
(x=44, y=21} I think
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
C. 1 centimeter = 30 meters
