I'm not trying to be rude or anything, but, generally it'd be fair to provide some idea of your thought process to the question, that kind of thing, and show some idea of what you're thinking. You can easily get an answer to this kind of thing online, or find a method, folks on the forum are here to help with that method and to guide you through the process.
If you don't know the method, consider the range involved with the measurements... that should help with the uncertainty.