I the Standard Deviation Is the Positive Square Root of the Variance

Multiple Choice

i. The standard deviation is the positive square root of the variance. ii. For a symmetrical distribution, the variance is equal to the standard deviation.
iii. If the standard deviation of the ages of a female group of employees is six years and the standard deviation of the ages of a male group in the same plant is ten years, it indicates that there is more spread in the ages of the female employees.

A) (i) , (ii) and (iii) are all correct statements
B) (i) and, (ii) are correct statements but not (iii) .
C) (i) and, (iii) are correct statements but not (ii) .
D) (i) is a correct statement, but not (ii) or (iii) .
E) (i) , (ii) and (iii) are all false statements