P(X<=x) = 1 + 5.486 = 6.486
The z-score of the information given is,
z = (x - µ )/ σ 
Where,
µ = mean
 σ = standard deviation
From the information given,
x = 3.71
µ = 86
 σ  = √225 = 15
hence,
z = (3.71 - 86)/15 = -5.486
thus, 
P(X<=x) = 1 + 5.486 = 6.486
hence , P(X<=x) = 1 + 5.486 = 6.486
Learn more about variance here brainly.com/question/9304306
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Answer:
a
Step-by-step explanation:
 
        
             
        
        
        
15. 5 times 3 is 15. 
If you check, 15 divided by 3  is 5(red cars).
        
                    
             
        
        
        
Answer:
SA= 12pl+B
Step-by-step explanation:
 
        
             
        
        
        
Run is the horizontal change between points. Run in slope means the change in "x" .