3, -3
4, -4
these numbers all have the same "exact value"
3, -5 do not have the same exact value.
exact value is how many s[pots away from 0 it is
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It means that the observations are all close to their mean value.
It simply means that there is no limit to the number of values that x can take. It does not necessarily mean that x is very large. As Cantor proved, there are an infinite number of value between any two numbers - no matter how close together they are.
Approximately.
The mean
The absolute value of a number is the distance it is from zero on a number line. It is written as the number without any sign.