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?
Guest Oct 22, 2017

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 

CPhill  Oct 22, 2017
edited by CPhill  Oct 22, 2017

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