It’s a little complicated but here’s how it works:
Imagine a table with the intervals 
0:4 , 4:6 , 6:7 , 7:10 , 10:13 (10 year intervals)
Then we have different rows
Class width: 4 , 2 , 1 , 3 , 3
Freq density: 0.2 , 0.5 , 1.2 , 0.7 , 0.3
So now calculate frequency where freq = class width * density
Freq: 0.8 , 1 , 3.6 , 2.1 , 0.9 
So to find median find cumulative frequency 
(Add all freq) 
Cfreq = 8.4 now divide by 2 = 4.2
So find the interval where 4.2 lies. 
0.8 + 1 = 1.8 + 3.6 = 5.6
So 4.2 (median) will lie in that interval 60-70 years.
        
             
        
        
        
Answer:
the reciprocal of 2/7 is 7/2. you just switch the numbers 
 
        
             
        
        
        
 Answer:
6a (6a + 4)
Step-by-step explanation:
What is the highest number that goes both into 36 and 24? That is 6. What else do they have in common? The letter a
So 6a(6a + 4)
 
        
             
        
        
        
Answer: I think the answer is -3 2/5✨
 
        
             
        
        
        
The answer is b I hope I could help