Usage of "±"?

mercredi 27 avril 2016

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Hi, I saw that '±' is used in Ping readings but I'm not sure what it means. Can anyone explain it to me. My ping for example is; 31 ± 1.2 but I don't know if this means that my ping is 32.2 or something else. I don't understand why there are 2 numbers and not one consolidated number for Ping.... Usage of "±"?

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