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 What proportion is greater than the mean by more than 120? Mean = 1200, STDEV=120

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The resistance of certain carbon resistors is normally distributed with a mean value of 1200 ohms and a standard deviation of 120 ohms. What proportion of the resistors have resistances that differ from the mean resistance by more than 120 ohms?
 Oct 22, 2017

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avatar+128408 
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If 120 ohms represents 1 standard deviation,  68.2%  of the resistors fall within this

 

So....100 - 68.2  = 31.8%  of the resistors differ from the mean by more than 120 ohms  

 

 

cool cool cool 

 Oct 22, 2017
edited by CPhill  Oct 22, 2017

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