Determine the variation in this unordered data set by finding the range.12, 13, 18, 21, 17, 12, 12, 21, 18

To find the range in an unordered data set, you need to subtract the smallest number from the largest number.

Here are the steps:

1. Identify the smallest and largest numbers in the data set. In this case, the smallest number is 12 and the largest number is 21.

2. Subtract the smallest number from the largest number.

So, 21 - 12 = 9

Therefore, the range of the data set is 9.

To find the range in an unordered data set, you need to subtract the smallest number from the largest number.

Step 1: Identify the smallest and largest numbers in the data set. In this case, the smallest number is 12 and the largest number is 21.

Step 2: Subtract the smallest number from the largest number.

So, 21 - 12 = 9

Therefore, the range of the data set is 9.