Answer:
E 0.923
Step-by-step explanation:
The Z score is a measurement used in statistics to determine the relationship between a value and a mean of a group of values measured as standard deviation from the mean. The z score (z) is given as:
 , Where μ is the mean, σ is the standard deviation and x is the value.
, Where μ is the mean, σ is the standard deviation and x is the value.
Given that:
σ = 7, μ = 80 and x = 90  

From the normal distribution table, P(X < 90) = P(z < 1.43) = 0.923
 
        
             
        
        
        
 Circumference~(pi)(diameter)~28.26
Area~ (pi)(radius)squared~63.59
I believe these are right
        
                    
             
        
        
        
172,000 is the answer I think
        
                    
             
        
        
        
Answer:
The answer is "1.30".
Step-by-step explanation:
Proportion of population
Ratio sample
Statistics of the test:

        
 
        
             
        
        
        
Answer:
4.5 I hope I was not to late