**781. Three factories A, B, C have 100, 200 and 300 workers respectively. The mean of the wages is the same in the three factories. Which of the following statements is true?**

A.There is greater variation in factory C.

B.Standard deviation in. factory A is the smallest.

C.Standard deviation in all the three factories are equal**D.None of the above**

**782. Which of the following measures of dispersion is independent of the units employed?****A.Coefficient of variation**

B.Quartile deviation

C.Standard deviation

D.Range

**783. The first and second moments about arbitrary constant are -2 and 13 respectively, The standard deviation will be:**

A.-2**B.3**

C.9

D.13

**784. If the third central is negative, the distribution will be:**

A.Symmetrical

B.Positively skewed**C.Negatively skewed**

D.Normal

**785. The lack of uniformity or symmetry is called:****A.Skewness**

B.Dispersion

C.Kurtosis

D.Standard deviation

**786. If mean=10, median=8 and standard deviation=6, then coefficient of skewness is:****A.1**

B.-1

C.2/6

D.2

**787. In a symmetrical distribution Q1 = 20 and median= 30. The value of Q3 is:**

A.50

B.35**C.40**

D.25

**788. If there are ten values each equal to 10, then standard deviation of these values is:**

A.100

B.20

C.10**D.0**

**789. If all values are considered equal in calculating an index, the index is**

A. simple

B. weighted**C. un-weighted**

D. None of these

**790. Which price indices is made by Federal Bureau of statistics?**

A. Consumer price index

B. Sensitive price index

C. The whole seller price index**D. All of the above**