The average production of all machines in a fabrication is 18 finished materials in one hour with a standard deviation of 4 materials per hour. What is the probability that a sample of 6 machines will produce more than 20 materials per hour?          A. 10.12%       B. 11.12%       C. 11.15%       D. 12.11%

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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The average production of all machines in a fabrication is 18 finished materials in one hour with a standard deviation of 4 materials per hour. What is the probability that a sample of 6 machines will produce more than 20 materials per hour? 
 
 
 
 
A. 10.12%
 
 
 
B. 11.12%
 
 
 
C. 11.15%
 
 
 
D. 12.11%
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