Question

Akira estimated that a tree was 40 years old. The true age of the tree was 47 years old.

Which expression can be used to calculate the percent error in Akira’s estimate?

Answer 1

The formula for percent error is :
`\frac Exact\quad value \cdot 100`.

So let's plug the given values in the formula.


`\frac \cdot 100=\quad \frac { 47 } \cdot 100=\frac { 7 }{ 47 } \cdot 100=0.148\cdot 100=\frac { 148 }{ 1000 } \cdot 100=\frac { 148 }{ 10 } =14.8`

The percent error is 14.8%