Answer:
x=  
6
9−  
285
  
  
  
 =  
2
3
  
 −  
6
1
  
  
285
  
 =−1.314
x=  
6
9+  
285
  
  
  
 =  
2
3
  
 +  
6
1
  
  
285
  
 =4.314
Step-by-step explanation:
 
        
             
        
        
        
Hey there :)
Let 
p represent the number of bags to be bought
We need to collect 
30 stickers and each 
bag has 
3 stickers
                    3p                                =                        30
                      ↑                                                           ↑
Number of stickers in a bad       Number of stickers to be collected

 = 
 p = 10
p = 10We need to buy 10 bags of crisps to have 30 stickers
 
        
        
        
Mean: $620, Mode: $600
Let's sort the rank stats.
First quartile: $580
Median: $610 
Third quartile: $645
 85th percentile: $685
OK, we're ready.  What happened to a and b?
c. $645 is the third quartile, 75th percentile.  That means 25% of the salaries are higher.
Answer: 25%
d.  $685 is the 85th percentile, 15% greater.
Answer: 15%
e.  The mean is the sum of all the salaries divided by the count.  
Mean = Sum / Count
So the sum is the count times the mean,
Sum = Count × Mean  = 100 × $620 = $62,000
Big payroll.
Answer: $62,000