Multiple choice

The standard deviation of 15 items is 4 and their mean is 20. Calculate the coefficient of variance.

  1. 15%

  2. 30%

  3. 20%

  4. 35%
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C Correct answer
Explanation

Coefficient of Variance = (Standard Deviation / Mean) * 100. CV = (4 / 20) * 100 = 20%.

AI explanation

The coefficient of variation is calculated as the standard deviation divided by the mean, multiplied by 100. Substituting the given values gives 4 divided by 20, which equals 0.2. Multiplying by 100 gives a coefficient of variation of 20 percent.

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