Tension depends on various things:
1: Gauge of string. Strings can go from light (a 95 E) to heavy (a 110 E), for instance.
2: Type of string. In general, flatwound strings will have more tension than roundwound. The material that the string is made of also has an effect.
3: Brand - different brands will obviously have different aspects about their strings, so two sets of strings of the same gauge and type will differ from one brand to the next.
It doesn't matter so much but you will most probably have to have your bass set-up to accommodate the different tension.
Many people tend to use the D'addario tension guide as a reference, but this of course only measures the tensions of D'addario's strings. That said, it is an adequate reference: http://daddario.com/upload/tension_chart_13934.pdf
Also, the strings you purchased should publish the tensions on the package somewhere.
There is no right or wrong tension, it is simply another preference of the player.