**731. Which of the following statements is correct?**

A.The standard deviation of a constant is equal to unity

B.The sum of absolute deviations is minimum if these deviations are taken from the mean.

C.The second moment about origin equals variance**D.The variance is positive quantity and is expressed in square of the units of the observations**

**732. In a set of observations the variance is 50. All the observations are increased by 100%. The variance of the increased observations will become:**

A.50**B.200**

C.100

D.No change

**733. All odd order moments about mean in a symmetrical distribution are:**

A.Positive

B.Negative**C.Zero**

D.Three

**734. The first three moments of a distribution about the mean X are 1, 4 and 0. The distribution is:****A.Symmetrical**

B.Skewed to the left

C.Skewed to the right

D.Normal

**735. For a positively skewed distribution, mean is always:**

A.Less than the median

B.Less than the mode**C.Greater than the mode**

D.Difficult to tell

**736. Bowley’s coefficient of skewness lies between:**

A.0 and 1**B.1 and +1**

C.-1 and 0

D.-2 and +2

**737. The second and fourth moments about mean are 4 and 48 respectively, then the distribution is:**

A.Leptokurtic

B.Platykurtic**C.Mesokurtic or normal**

D.Positively skewed

**738. The measures used to calculate the variation present among the observations in the unit of the variable is called:**

A.Relative measures of dispersion

B.Coefficient of skewness**C.Absolute measures of dispersion**

D.Coefficient of variation

**739. The measure of dispersion which uses only two observations is called:**

A.Mean

B.Median**C.Range**

D.Coefficient of variation

**740. Half of the difference between upper and lower quartiles is called:**

A.Interquartile range**B.Quartile deviation**

C.Mean deviation

D.Standard deviation