In science class, Mr. Brodell’s students were directed to weigh a 400-gram mass on the balance scale. Erika weighed the object and reported 420 grams. What is the percent error of the weight of Erika's object?
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%
The percent error can be calculated using the following formula:
Percent Error = ((Measured Value - Actual Value) / Actual Value) * 100
In this case, the measured value is 420 grams, and the actual value is 400 grams.
((420 - 400) / 400) * 100 = (20 / 400) * 100 = 0.05 * 100 = 5%
Therefore, the percent error of the weight of Erika's object is 5%.