Answer:
I think so, but maybe if the schools are different they change.
 
        
             
        
        
        
Every confidence interval has associated z value. As confidence interval increases so do the z value associated with it. 
The confidence interval can be calculated using following formula:

Where 

 is the mean value, z is the associated z value, s is the standard deviation and n is the number of samples.
We know that standard deviation is simply a square root of variance:

The confidence interval of 95% has associated z value of <span>1.960.
</span>Now we can calculate the confidence interval for our income:
 
 
        
        
        
Answer:

Step-by-step explanation:
x² = 19x + 12
⇔ x² - 19x - 12 = 0
Calculating the discriminant :
b² - 4ac = (-19)² - 4×1×(-12) = 409 
The discriminant is positive ,then the equation has two solutions.

 
        
             
        
        
        
Answer:
m = 1/3
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
the 4 is the base and the 5 is the exponent
7^2 is the exponential form of 7*7
10^2
5^4