iran-konkur 2013 Q142

iran-konkur · Other · konkur-riazi_1392 Measures of Location and Spread
142- In 12 statistical data, the total sum of all data is 72 and the sum of their squares is 480. What is the coefficient of variation of this data?
(1) $\dfrac{1}{4}$ (2) $\dfrac{1}{9}$ (3) $\dfrac{1}{3}$ (4) $\dfrac{2}{5}$
\textbf{142-} In 12 statistical data, the total sum of all data is 72 and the sum of their squares is 480. What is the coefficient of variation of this data?

(1) $\dfrac{1}{4}$ \qquad (2) $\dfrac{1}{9}$ \qquad (3) $\dfrac{1}{3}$ \qquad (4) $\dfrac{2}{5}$