75 is your answer
Hope this helped
Happy Holidays!
        
                    
             
        
        
        
Answer:
 
And if we solve for a we got
 
And for this case the answer would be 35185 the lowest 1% for the salary 
Step-by-step explanation:
Let X the random variable that represent the salary, and for this case we can assume that the distribution for X is given by:
 
  
Where  and
 and  
And we want to find a value a, such that we satisfy this condition:
 (a)
   (a)
 (b)
   (b)
We can use the z score again in order to find the value a.  
As we can see on the figure attached the z value that satisfy the condition with 0.01 of the area on the left and 0.99 of the area on the right it's z=-2.33. On this case P(Z<-2.33)=0.01 and P(z>-2.33)=0.99
If we use condition (b) from previous we have this:
 
  
 
But we know which value of z satisfy the previous equation so then we can do this:
 
And if we solve for a we got
 
And for this case the answer would be 35185 the lowest 1% for the salary 
 
        
             
        
        
        
The circumference of a circle of radius  is
 is

So, in your case, the circumference is

The circumference is actually the length of the "perimeter", so the answer to questions 1 and 2 looks the same actually
 
        
             
        
        
        
X will equal -7 in this problem