The answer to the question is b
 
        
        
        
Answer:
fun for kids and family fun 
Step-by-step explanation:
 
        
             
        
        
        
1) Mean
The mean is given by the sum of the data divided by the number of data (4, in this case):

2) Standard deviation
The standard deviation is given by:

where 

 is the mean, that we already found at point 1), and N=4. Substituting data, we have:

 
 
        
        
        
ANSWER 
  or
 or 
EXPLANATION
For 
We make y the subject to obtain,
 
We can easily graph this function, because we just have to transform the graph of  by shifting the intercept up to
 by shifting the intercept up to  .
.
As for the straight line,  ,
,
We find the intercepts as follows,
When  .
.
When  .
.
We plot the points  and
 and
  .
.
We now draw the two graphs on the same graph sheet. The intersection of the two graphs gives the solution to be
  or
 or 
See graph
 
        
             
        
        
        
Answer:
I think the answer might be 0.012
Step-by-step explanation: