Answer:
Between 21 years and 75 years
Step-by-step explanation:
Given that a real estate company is interested in the ages of home buyers. They examined the ages of thousands of home buyers and found that the mean age was 48 years old, with a standard deviation of 9 years. 
X the ages of home buyers is N(48, 9)
a) 
Hence using Cheby chev inequality

b) 

c) Using normal distribution we have

d) z value is 2.97
Hence x lies between

Between 21 years and 75 years
 
        
             
        
        
        
Answer:
Point D
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer: She makes $550
Step-by-step explanation:
 
This is because to find the answer you do 10000t imes 5.5%
And 5.5% is 0.055
So you do 10000 times 0.055
Which is 550 
 
        
                    
             
        
        
        
Answer:
yes thats good
Step-by-step explanation:
 
        
             
        
        
        
Median= 3
Range= 5
Mode= 3
Mean= 4