Jill estimated a room to be 18ft tall. It was actually only 15 ft tall. What is her percentage of error? (tenth)

Answer 1

To calculate Jill's percentage of error, we can use the formula for percentage error:

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

In this case:

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

Now, substituting the values into the formula:

$$\text{Percentage of Error}=\left(\frac{|18-15|}{15}\right)\times 100$$

$$=\left(\frac{3}{15}\right)\times 100$$

$$=0.2\times 100$$

$$=20$$

Therefore, Jill's percentage of error is 20.0%.