Answer:
number 1 is 2 number 2 is 15 number 4 is 30
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Option A is correct.
y = 35.4 bushels per acre when rainfall = 7.1 inches
Step-by-step explanation:
An image of the steps to obtain the equation that relates x to y is attached to this answer.
n = number of variables = 9
μₓ = mean of variable x (rainfall in inches)
μᵧ = mean of variable y (yield in bushels per acre) 
σₓ = standard deviation of variable x (rainfall in inches)
σᵧ = standard deviation of variable y (yield in bushels per acre) 
y = 4.379x + 4.268
when x = 7.1
y = 4.379(7.1) + 4.268 = 35.3589 = 35.4 bushels per acre.
 
        
             
        
        
        
The Answer to your problem is:
0.8
 
        
                    
             
        
        
        
Step-by-step explanation:
what type of help u want......