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August 12th, 2008, 04:31 AM   #1
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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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