jill estimated a room to be 18ft tll it was actually only 15ft tall what is her prcantage error

To calculate the percentage error in Jill's estimate, you can use the formula for percentage error:

\[ \text{Percentage Error} = \left( \frac{|\text{Estimated Value} - \text{Actual Value}|}{\text{Actual Value}} \right) \times 100 \]

In this case:

• Estimated Value = 18 ft
• Actual Value = 15 ft

First, calculate the absolute error:

\[ |\text{Estimated Value} - \text{Actual Value}| = |18 - 15| = 3 \]

Now, plug the values into the percentage error formula:

\[ \text{Percentage Error} = \left( \frac{3}{15} \right) \times 100 \]

\[ \text{Percentage Error} = 0.2 \times 100 = 20% \]

So, Jill's percentage error is 20%.