To find the range of the hems' lengths, you need to subtract the shortest length from the longest length.
First, let's identify the longest and shortest lengths from the given data:
- The lengths of the hems are: 26, 27, 26, 22, 26, 27, 31, 25, and 31 inches.
The longest length is 31 inches, and the shortest length is 22 inches.
Now, calculate the range:
\[ \text{Range} = \text{Longest length} - \text{Shortest length} = 31 \text{ inches} - 22 \text{ inches} = 9 \text{ inches} \]
So, the range of the hems' lengths is 9 inches.