Answer:
g = 30
Step-by-step explanation:
Plus with minus inside brackets give us minus
 
        
             
        
        
        
Answer:
 between 78 and 102 texts and more than 78 text messages. 
Step-by-step explanation:
 the range of it is 102-178, so its between there, and its more than 78 as well if the range goes up to 102
 
        
                    
             
        
        
        
Step-by-step explanation:
not sure about last question but...did it with all my will..
 
        
             
        
        
        
Answer:
Confidence interval:  (1760,1956)
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 81
Sample mean = 

Population standard deviation =

Confidence Level = 95%
Significance level = 5% = 0.05
Confidence interval:

Putting the values, we get,

