Which one of the following statements is true?
1
The sum of absolute deviations measured from Median is the least
2
If each value in a given series is multiplied by a constant: K. the variance of the new series would be equal to the variance of the given series
3
The variance is the square of the value of the standard deviation divided by mean
4
Z-score value of X' is the ratio between 'X’ divided by mean