Solution: The square root of a square simplifies to the absolute value:
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- \text{Mean} = \frac{0.8 + 1.2 + 1.0 + 0.9 + 1.1}{5} = \frac{5.0}{5} = 1.0
- The arithmetic mean is \boxed{1.0} liters.
- Question: Solve for $ x $ in the equation $ \sqrt{(x - 4)^2} = 9 $, where $ x $ represents the number of hours a mammal rests daily.
- |x - 4| = 9
- This gives two cases:
- $ x - 4 = 9 \Rightarrow x = 13 $
