Final answer:
The least precise measurement is 1.89 kg.
Step-by-step explanation:
The least precise measurement is 1.89 kg.
Let's compare the numbers:
- 1.05 kg
- 1.005 kg
- 1.89 kg
- 1.1 kg
Among these numbers, 1.89 kg has the largest value, indicating more precision. Therefore, it is the least precise number.