range

In statistics:

The range is a number that is a measure of how spread of a set of data is.

It is calculated by subtracting the lowest value from the highest value.

Range = Highest value - lowest value

eg 1, 1, 2, 3, 4, 5, 6, 6, 6, 7, 8, 9 Range = 9 - 1 = 8

The difference between the highest and lowest value is 8.

In the Cartesian Plane:

The domain is a set of all values that can be 'put into' a function. These are the x values we can substitute into the function.

The range is a set of all values that the function produces. These are the y values that a graph or function can be.

Example

The domain of the parabola above is all possible x values (we can substitute any x value into the function).

The range is only values from 0 and above (x is greater than or equal to 0).

The y values can only be 0 or greater - this is because a negative number squared produces a positive number.

You can see on the graph that the parabola does not come down below the y-axis.