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August 12th, 2008, 04:31 AM  #1 
Newbie Joined: Aug 2008 Posts: 1 Thanks: 0  Calculate the standard deviation of a value from 2 values
hi, can anyone answer to this: you have a value A1 with an associated standard deviation S1 and a second value with A2,S2. If i calculate: C = (1/S1 * A1 + 1/S2 * A2) / (1/S1 + 1/S2) how could i calculate the standard deviation of C from S1 and S2? thanx in advance for the answers 

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calculate, deviation, standard, values 
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