The coefficient of variance is the ratio betwixt touchstone departure as well as the hateful of a information as well as expressed in%.
Variance coefficient Formula
CV = (S/x̄) x 100%
Information :
S = Standard deviation
x̄ = Mean of dataCV = Coefficient of variance
Example :
The average fluorescent light tin last used for 2,800 hours alongside touchstone departure of 700 hours, acre the incandescent light tin last used on average for 3,500 hours alongside touchstone departure of 1,050 hours. from which information is amend ?
Answer :
1. Variance coefficient of fluorescent light usage is :
S = 700
x̄ = 2,800
CV = (S/x̄) x 100%CV = (700/2,800) x 100%CV = (1/4) x 100%CV = 0.25 x 100%CV = 25%
2. Variance coefficient of incandescent light usage is :
S = 1,050
x̄ = 3,500
CV = (S/x̄) x 100%CV = (1,050/3,500) x 100%CV = 0.3 x 100%CV = 30%
From the calculation of the coefficient of variance, the fluorescent light is amend than the incandescent lamp, because the larger KV fluorescent lamps are KV incandescent.
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Reference :
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