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.
what is the percent error in laceys estimate?
%

Explanation:

Step1: Recall the formula for percent error

The formula for percent error is $Percent\ Error=\frac{\vert Estimated - Actual\vert}{Actual}\times100\%$. Here, the estimated value for Lacey is $154$ and the actual value is $220$. The amount of error is $66$.

Step2: Calculate the percent error

Using the formula $Percent\ Error=\frac{66}{220}\times 100\%$. First, simplify $\frac{66}{220}=\frac{66\div22}{220\div22}=\frac{3}{10}$. Then, $\frac{3}{10}\times100\% = 30\%$.

Answer:

$30$