Mathematics, 23.10.2020 19:50, abbeyj4737

Please help dont understand at all percentage error is calculated as the actual error as a percentage of the correct amount . joey measured his heart rate as 99 beats per minute . his actual heart rate was 90 beats per minute
what is the percentage error ?
and show working out

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Please help dont understand at all percentage error is calculated as the actual error as a percenta...