**771. If X̄ = Rs.20, S= Rs.10, then coefficient of variation is:**

A.45%**B.50%**

C.60%

D.65%

**772. The second moment about arithmetic mean is 16, the standard deviation will be:**

A.16**B.4**

C.2

D.0

**773. First two moments about the value 2 of a variable are 1 and 16. The variance will be:**

A.13**B.15**

C.16

D.Difficult to tell

**774. Departure from symmetry is called:**

A.Second moment

B.Kurtosis**C.Skewness**

D.Variation

**775. If mean=50, mode=40 and standard deviation=5, the distribution is:****A.Positively skewed**

B.Negatively skewed

C.Symmetrical

D.Difficult to tell

**776. In case of positively skewed distribution, the extreme values lie in the:**

A.Middle

B.Left tail**C.Right tail**

D.Anywhere

**777. Which of the following is correct in a negatively skewed distribution?**

A. The arithmetic mean is greater than the mode

B. The arithmetic mean is greater than the median

C. (Q3 – Median) = (Median – Q1)**D. (Q3 – Median) < (Median – Q1)**

**778. If Q3=20 and Q1=10, the coefficient of quartile deviation is:**

A.3**B.1/3**

C.2/3

D.1

**779. The average of squared deviations from mean is called:**

A.Mean deviation**B.Variance**

C.Standard deviation

D.Coefficient of variation

**780. Which of the following is a unit free quantity:**

A.Range

B.Standard deviation**C.Coefficient of variation**

D.Arithmetic mean