Given:
He thought he had purchased 7 folders.
He had only purchased 6.
To find:
The per cent error.
Explanaton:
According to the problem,
The predicted value is 7.
The actual value is 6.
Using the formula,
[tex]\begin{gathered} Percent\text{ error }=\frac{|Prediction-Actual|}{|Actual|}\times100 \\ =\frac{|Prediction-Actual|}{|Actual|}\times100 \\ =\frac{|7-6|}{6}\times100 \\ =\frac{1}{6}\times100 \\ =16.66 \\ \approx17\% \end{gathered}[/tex]
Therefore, the percent error is 17%.
Final answer:
The percent error is 17%.
