Answer:
6750
Step-by-step explanation:
4 digit numbers are 1000,1001,1002,...,9999
let numbers=n
d=1001-1000=1
9999=1000+(n-1)1
9999-1000=n-1
8999+1=n
n=9000 
now let us find the 4 digit numbers divisible by 4
4| 1000
______
 | 250
4 |9999
   _____
   | 2499-3
9999-3=9996
so numbers are 1000,1004,1008,...,9996
a=1000
d=1004-1000=4
let N be number of terms 
9996=1000+(N-1)4
9996-1000=(N-1)4
8996=(N-1)4
N-1=8996/4=2249
N=2249+1=2250
so number of 4 digit numbers not divisible by 4=9000-2250=6750
 
        
             
        
        
        
Mean means average, so you would add the numbers up and divide by the amount of numbers in the set. 
        
             
        
        
        
<span>Peter paid </span>84 cent in taxs
        
                    
             
        
        
        
The area is 15 14/64 which simplifies to 15 4/14 becuse you multiply width times length