Question

The sum of 10 observations is 80 and the sum of their squares is 800. Find the coefficient of
variation of the observations.
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Answer 1

Step-by-step explanation:

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Answer 2

Answer: 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