Question

Andy estimated that he would need 70 feet of lumber for a tree house project. He later found that the actual amount of lumber needed was 59 feet. What was the percent error of Andy's estimation?

Answer 1

The percent error of Andy's estimation is 18.64 %

Solution:

Given, Andy estimated that he would need 70 feet of lumber for a tree house project

The actual amount of lumber needed was 59 feet  

We have to find what was the percent error of Andy's estimation

The error percentage is given as:

$\text { percent error }=\frac{\text { lexpected amount-actual amountl }}{\text { actual amount }} \times 100$

$\text { Percent error }=\frac{|70-59|}{59} \times 100$

$=\frac{11}{59} \times 100=0.18644 \times 100$

$\text { Percent error }=18.64 \%$

Hence, the andy’s percent error is 18.64%