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68 – 95 – 99.7 rule

68 – 95 – 99.7 rule

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5. Coefficient of

Variation









A standard measure used to compare the

relative variation

Formula:



σ

cv = × 100%

x



Example





Over a period of three months, the daily

number of components produced by two

comparable machines was measured,

giving the following statistics:

- Machine A:



xA = 242.8



σ = 20.5



- Machine xB = 281.3

B:



σ = 23.0



Example

- The coefficient of variation for machine A:



- The coefficient of variation for

machine B:



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68 – 95 – 99.7 rule

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