Question

the jar has a total of 220 marbles. the table shows the estimates of three different students and the amount of error in each of the estimates. the class wants to know who has the best estimate.
student | estimated amount of marbles | correct amount of marbles | amount of error | percent error
bree | 253 | 220 | 33 | 15
lacey | 154 | 220 | 66 |
miguel | 187 | 220 | 33 |
what is the percent error in laceys estimate?
%

Explanation:

Step1: Recall percent error formula

Percent Error = $\frac{\text{Amount of Error}}{\text{Correct Amount}} \times 100\%$

Step2: Identify values for Lacey

Amount of Error = 66, Correct Amount = 220

Step3: Substitute into formula

Percent Error = $\frac{66}{220} \times 100\%$

Step4: Calculate the fraction

$\frac{66}{220} = 0.3$

Step5: Convert to percentage

$0.3 \times 100\% = 30\%$

Answer:

30