Measures of Dis...

Semi inter-quartile deviation is given by the formula _______.

The measure of the dispersion which ignores signs of the deviations from a central value is _______.

The co-efficient of quartile deviation from the following observations is 
$$10, 18, 20, 28, 15, 17, 22, 25, 29, 32, 34$$

If a constant value $$15$$ is subtracted from each observation of a set, the variance is ________.

If each observation of set is divided by $$10$$, the S.D of the new observations is ______.

Which measure of dispersion is least affected by extreme values?

Sum of squares of the deviations is minimum when deviations are taken from ________.

Which measure of dispersion ensures highest degree of reliability?

Range of a set of values is $$60$$ and maximum value in the series is $$80$$. The minimum value of the series is _______.

If $$Q_3 + Q_1 = 108, Q_3 - Q_1 = 74$$; then Q.D is _______.