The z-score associated with 14.3 is 0.84.  0.2995 of the population is between 12.2 and 14.3.  0.1894 of the population is less than 10.0.
The formula for a z-score is
z=(X-μ)/σ
With our data, we have:
z=(14.3-12.2)/2.5=0.84
The z-score associated with the mean is 0.5.  To find the proportion of the population between the mean and 14.3, subtract 0.7995 (the proportion of population below the z-score of 0.84, using http://www.z-table.com) and 0.5:
0.7995 - 0.5 = 0.2995.
The z-score for 10.0 is
(10.0-12.2)/2.5 = -0.88.  The proportion of the population less than this is 0.1894.
        
             
        
        
        
Answer:
60th caller.
the 12th caller would hit a number divisible by 20 at 60.
12,24,35,48,60
 
        
             
        
        
        
20/36 reduced is 5/9. hope this helped!  :)
        
                    
             
        
        
        
Answer:4.5 x 2
Step-by-step explanation:
4.5 x 2 = 9 
Hope it helps