You can’t see, smell, or taste radon, but it could be present at a dangerous level in your home.  Radon is the leading cause of lung cancer deaths among nonsmokers in America and claims the lives of about 20,000 Americans each year.

 In fact, the EPA and the U.S. Surgeon General urge all Americans to protect their health by testing their homes, schools, and other buildings for radon. Exposure to radon is a preventable health risk, and testing radon levels in your home can help prevent unnecessary exposure.  If a high radon level is detected in your home, you can take steps to fix the problem to protect yourself and your family.

When radon testing is conducted, the EPA is recommending doing either simultaneous or sequential testing, for more accurate results.  This simply means have two devices performing a test in the same conditions, at the same time, and in the same location (at least 4″ apart) OR performing two tests back-to-back in the same conditions, at the same time, and in the same location.

There is some math required to analyze your results, and the calculator below is provided.
Or… have us do it! 

To Calculate Mean, Variance, Standard deviation:Enter all the numbers separated by comma ‘,’ E.g: 13,23,12,44,55

Results:
Total Numbers:
Mean (Average):
Standard deviation:
Variance(Standard deviation):
Population Standard deviation:
Variance(Population Standard deviation):

Any readings of either 4 pCi/L or 0.02 WL and higher, the EPA recommends mitigating to reduce the radon level. You may want to consider mitigating even if it is slightly lower, depending on health status.

Here is a link to the EPA various aspects of Radon, and how you can protect yourself and your family.
http://www.epa.gov/radon/pubs/citguide.html