Question

Roger has a nail that is 12 centimeters long he measures and records the length of the nail at 15 centimeters what is the percent of error in his measurement

Answer 1

20% because the 15-12=3 and then you cross multiply 3 and 100 and then you divide by 15. Which is 20.
3. x
-- --
15 100

Answer 2

Answer:

The  percent of error in his measurement is:

                             25%

Step-by-step explanation:

The percent error is calculated by the formula:

$\text{Percent error}=\dfrac{|\text{Recorded measurement-Actual measurement}|}{\text{Actual measure}}\times 100$

Roger has a nail that is 12 centimeters long he measures and records the length of the nail at 15 centimeters.

Hence,

$\text{Percent error}=\dfrac{|15-12|}{12}\times 100\\\\\text{Percent error}=\dfrac{3}{12}\times 100\\\\\text{Percent error}=25\%$

          Hence, the percent error is: 25%.