To calculate Teresa’s percent error in estimating the height of the giraffe, we use the following formula for percent error:
\[ \text{Percent Error} = \left( \frac{\text{Estimated Value} - \text{Actual Value}}{\text{Actual Value}} \right) \times 100 \]
Let's plug in the values:
- Estimated Value = 18 feet
- Actual Value = 16 feet
Now, we can calculate the percent error step by step:
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Calculate the difference between estimated and actual values: \[ \text{Difference} = \text{Estimated Value} - \text{Actual Value} = 18 - 16 = 2 \text{ feet} \]
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Calculate the percent error: \[ \text{Percent Error} = \left( \frac{2}{16} \right) \times 100 \]
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Calculate the fraction: \[ \frac{2}{16} = 0.125 \]
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Multiply by 100 to get the percentage: \[ 0.125 \times 100 = 12.5 \]
So, Teresa's percent error is:
\[ \text{Percent Error} = 12.5% \]
Final answer: 12.5%