Your answer is C hope this helps :)
Answer: 6.416%
Step-by-step explanation:
The percentage error formula is given by :-
![\%\text{error}=\dfrac{|\text{Estimate-Actual}|}{\text{Actual}}\times100](https://tex.z-dn.net/?f=%5C%25%5Ctext%7Berror%7D%3D%5Cdfrac%7B%7C%5Ctext%7BEstimate-Actual%7D%7C%7D%7B%5Ctext%7BActual%7D%7D%5Ctimes100)
Given : The estimated weight of a substance = 475 mg
The actual weight of the substance = 445 mg
Then,
![\%\text{error}=\dfrac{| 475-445|}{445}\times100\\\\=\dfrac{30}{445}\times100=6.74157303371\approx6.416\%](https://tex.z-dn.net/?f=%5C%25%5Ctext%7Berror%7D%3D%5Cdfrac%7B%7C%20475-445%7C%7D%7B445%7D%5Ctimes100%5C%5C%5C%5C%3D%5Cdfrac%7B30%7D%7B445%7D%5Ctimes100%3D6.74157303371%5Capprox6.416%5C%25)
Hence, the percentage error in the first weighing. = 6.416%
Answer: 30
Step-by-step explanation: