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A discrete quantity is a quantity that can only take distinct, separate values in an interval. There are no values between these distinct values. The number of students in a class, the number of tickets for a concert, and the number of goals scored in a soccer match are examples of discrete quantities. These values are countable and typically represented by integers or whole numbers.
Note that the value of the quantity can only be specific amounts such as 0, 1, or 2, as a fraction or part of a discrete quantity is not an option. Imagine buying only part of a concert ticket! Now, although discrete quantities are often restricted to whole numbers, there are exceptions. Depending on the context, discrete quantities can take values from a set like {7,7.5,8,8.5,9}.