For example, the variable " the number of children" is discrete and the variable " GPA" is continuous. Since GPA can take an infinite number of possible values, for example interval 0.0 to 4.0.
GPA is an interval measurement, subtraction can be used and distances would make sense. For instance, the distance from 2.3-2.4 is the same distance as 3.7-3.8. However, ratios do not make sense, is 5.0 `twice as high' as 2.5?
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Of course, fish lasts for a shorter period of time if it is not stored properly. But remember that fish, like a lot of other proteins, usually has a sell by date and not a use by date or expiration date. Because of this distinction, you may safely use fish even after the sell by date has lapsed.