What is the range of the heights?

To find the range of the heights, we subtract the smallest height from the largest height.

The heights given are:
- 190, 179, 181, 186, 174, 171, 174, 184, 183, 174

1. **Identify the maximum height:** 190 cm
2. **Identify the minimum height:** 171 cm

Now, calculate the range:

\[
\text{Range} = \text{Maximum height} - \text{Minimum height} = 190 - 171 = 19 \text{ cm}
\]

Therefore, the range of the heights is **19 cm**.