Answer:
1.) mean 
2.) H0 : μ = 64
3.) 0.0028
4) Yes 
Step-by-step explanation:
Null hypothesis ; H0 : μ = 64
Alternative hypothesis ; H1 : μ < 64
From the data Given :
70; 45; 55; 60; 65; 55; 55; 60; 50; 55
Using calculator :
Xbar = 57
Sample size, n = 10
Standard deviation, s = 7.14
Test statistic :
(xbar - μ) ÷ s/sqrt(n)
(57 - 64) ÷ 8 / sqrt(10)
Test statistic = - 2.77
Pvalue = (Z < - 2.77) = 0.0028 ( Z probability calculator) 
α = 10% = 0.1
Reject H0 ; if P < α
Here, 
P < α ; Hence, we reject the null 
 
        
             
        
        
        
The number of people who voted follows a binomial distribution with probability of having voted 

 and 

 subjects, which means the approximating normal distribution should have mean 

 and standard deviation 

.
With the continuity correction, you have
 
 
        
        
        
Answer:
the answer of the perimeter is B
 
        
             
        
        
        
Answer:x=15/6
Step-by-step explanation: