Answer:
<u>Yes, it is 30</u>
Step-by-step explanation:
And yes, you thought it through correctly.  6(X-Y) = 6*5
6(X-Y) = <u>30</u>
 
        
                    
             
        
        
        
Answer:
 
And we can find this probability using excel or the normal standard tabe and we got:
 
Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  
Solution to the problem
Let X the random variable that represent the temperatures of a population, and for this case we know the distribution for X is given by:
 
  
Where  and
 and  
We are interested on this probability
 
And the best way to solve this problem is using the normal standard distribution and the z score given by:
 
If we apply this formula to our probability we got this:
 
And we can find this probability using excel or the normal standard tabe and we got:
 
 
        
             
        
        
        
Answer:
Neuma should have only divided 9 by 9, not 54 by 9
Step-by-step explanation:
i hope it helps and is correct