1. The problem asks to find the percentage score to the nearest tenth of a percent given a score of 1 out of 5 with a penalty of 1 off. 2. First, calculate the raw percentage score without penalty using the formula: $$\text{Percentage} = \left(\frac{\text{Score}}{\text{Total}}\right) \times 100$$ 3. Substitute the values: $$\text{Percentage} = \left(\frac{1}{5}\right) \times 100 = 20\%$$ 4. Apply the penalty of 1 off. Assuming "1 off" means subtracting 1 percentage point: $$\text{Adjusted Percentage} = 20 - 1 = 19\%$$ 5. To the nearest tenth of a percent, the score is: $$19.0\%$$ Therefore, the final answer is 19.0%.