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Mariana and Felix were in science class and were using a test kit to measure the amount of calcium in milk. They measured the amount of calcium in cup of milk times and got a mean of mg. They looked up the amount of calcium that is typically in milk and found out it was  mg per cup. Percent error finds the difference between the actual value and measured value and the compares that difference to the actual value as a percentage. Find the percent error of Mariana and Felix’s measurement.  

Find the difference between the measured value and the actual value.

Divide the difference by the actual value.

Multiply this number by to get the percent error.