The sum of 10 observations is 80 and the sum of squares is 800.
Find the coefficient of variation of the observation.
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standard deviation is the square root of the arithmetic mean of the squares of the deviations measured from the arithmetic mean of the data.
Standard deviation = { (sum of the squares of the observations/ number of observations ) – (sum of observations/ number of observations ) } ½
= { (2800/10) –(110/10) } ½
= { 280- 11}1/2
= (169) ½
= 13
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