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Mathematics
Riya Butler
27 October, 18:24
How are percent error and percent change similar
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Deegan Davis
27 October, 21:33
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Percent Change = New Value - Old Value|Old Value| * 100%
Example: There were 200 customers yesterday, and 240 today:
240 - 200|200| * 100% = 40200 * 100% = 20%
A 20% increase.
Percent Error = |Approximate Value - Exact Value||Exact Value| * 100%
Example: I thought 70 people would turn up to the concert, but in fact 80 did!
|70 - 80||80| * 100% = 1080 * 100% = 12.5%
I was in error by 12.5%
(Without using the absolute value, the error is - 12.5%, meaning I under-estimated the value)
The difference between the two is that one states factual calculations and the other is a theoretical guess
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