Difference between discrete and continuous data

What is the difference between discrete and continuous data?  Discrete data usually involve counting a number of items, such as the number of books, computers, people, and so forth. Continuous data are data where numbers between any two data values make sense.

The figure below may help you understand the difference between discrete and continuous data? If not keep reading!

For discrete data, numbers between two data values will make no sense. For example, suppose that the cost of producing a car is 20000  dollars. This situation will give discrete data only since you cannot produce half of a car, three-fourths of a car or two and a half car.

Difference between discrete and continuous data

The table below shows the costs of producing 1, 2, 3, or 4 cars.

Number of cars         Cost                  Point

 1                              20000             (1, 20000)

                              40000             (2, 40000)

 3                              60000             (3, 60000)

 4                              80000             (4, 80000)

If the company could produce 1.5 car, it will cost 30000. However, there is no such thing as 1.5 car.  The figure below shows what the graph of a discrete data will look like for the table immediately above. 

Notice that we cannot connect the points since the numbers between 1 and 2, 2 and 3, 3 and 4 do not exist.

Discrete data

On the other hand, a continuous data can have numbers between any two data values that make sense. Suppose the cost of grapes is 3 dollars per pound. The number of pounds you buy could be 1, 1.5, 2, 3, 3.5, 4, ...

Notice that 1.5 is a number between 1 and 2. By the same token, 3.5 is a number between 3 and 4. You do not have to buy exactly 1, 2, 3, 4, or 5 pounds, etc...

Here is what the graph of a continuous data will look like.

Continuous data

In the graph above, we show the points (1 3), (2, 6), (3, 9), and (4, 12). (3, 9) of course means that 3 pounds cost 9 dollars.  Notice how any number of pounds could be chosen between 0 and 1, 1 and 2, 2 and 3, 3 and 4.

Recent Articles

  1. Quadratic Formula: Easy To Follow Steps

    Jan 26, 23 11:44 AM

    Quadratic formula
    Learn about the quadratic formula, the discriminant, important definitions related to the formula, and applications.

    Read More

  2. Area Formula - List of Important Formulas

    Jan 25, 23 05:54 AM

    Frequently used area formulas
    What is the area formula for a two-dimensional figure? Here is a list of the ones that you must know!

    Read More

Tough algebra word problems

100 Tough Algebra Word Problems.

If you can solve these problems with no help, you must be a genius!

Math quizzes


Math vocabulary quizzes