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Actual results divided by your expected results. Subtract that number from 1. Multiply that by 100.

For example:

Actual result : 9 grams

Expected result: 10 grams

9/10 = .9

1 - .9 = .1

.1 x 100 = 10

10% error.

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What is the formula to find the error as percent of span?

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