Hi(adsbygoogle = window.adsbygoogle || []).push({});

If I have measured the resonance frequency of three sets of resonators and calculated the mean, variance and standard deviation for each set. How do I add the three variances and standard deviations to get an overall variance and standard deviation?

Well, I know that the standard deviation is the square root of the variance and therefore I only need to know how to calculate the overall variance.

I hope that someone can help me with my problem. Thanks in advance.

Best regards

Tom

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Adding Variance

**Physics Forums | Science Articles, Homework Help, Discussion**