Middle School

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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 :

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:

[tex]\text { percent error }=\frac{\text { lexpected amount-actual amountl }}{\text { actual amount }} \times 100[/tex]

[tex]\text { Percent error }=\frac{|70-59|}{59} \times 100[/tex]

[tex]=\frac{11}{59} \times 100=0.18644 \times 100[/tex]

[tex]\text { Percent error }=18.64 \%[/tex]

Hence, the andy’s percent error is 18.64%

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