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range is the forgotten one of the 3 M's and the R (Mean, Median, Mode and Range) and to find the range, you take the highest number of the set of numbers and subtract the lowest number. e.g: 2,5,7,3,5,2,8,2,4 the range is 6 (8-2=6).
Confidence intervals represent a specific probability that the "true" mean of a data set falls within a given range. The given range is based off of the experimental mean.
It means the difference between the lowest and highest values E.G 100 - 80=20, so the range is 20.
The actual term is "effective range". That is the range where a trained shooter can consistently hit the target. For example- a 9mm pistol has an effective range of about 50 meters. However, it can shoot a bullet about 960 meters. But at that range, you will not consistently hit anything- except the earth.
The mathematical term for "mean" is "mean".The popular, or colloquial term for "mean" is "average".