Question

Michael thought he could read 23 pages of his book in class. He was only able to read 20. what is his percent error

Answer 1

Percent error is calculated using

((Actual - predicted) / actual) * 100

In this case, the actual value of the number of pages he read is 20. The expected value was 23. So simply plug in:

((20 - 23) / 20) * 100 = -15%

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