**831. What is the harmonic mean of two numbers x and y****A. 2xy/x+y**

B. xy/x+y

C. x+y/xy

D. 2/x + y

**832. Coding method is used for calculation of the**

A. weighted mean

B. Median**C. mean**

D. mode

**833. Two number 5 and 4 are Am and GM of numbers respectively then find HM of numbers.**

A. 25/16

B. 2/5**C. 16/5**

D. 2/5

**834. Mode of the series 2, 2, 2, 2, 3, 3, 4, 4, 3, 2, 2, 3, 4****A. 2**

B. 3

C. 4

D. none of these

**835. It is impossible to calculate ________________ if any value in series is zero.**

A. Geometric mean

B. Harmonic mean

C. Arithmetic mean**D. mode**

**836. Mode of 2, 3, 4 is**

A. 2

B. 3

C. 4**D. none of these**

**837. The collection of data, items or individuals under statistical study is called ______________**

A. parameter

B. Sample**C. Population**

D. Statistics

**838. When the sum of all the observations are dividing by their number, we obtain ____________**

A. Arithmetic mean

B. geometric mean

C. Harmonic mean**D. Mode**

**839. Statistics is a body of methods dealing with _____________**

A. The collection of data

B. The analysis and interpreting of data

C. The description of data**D. All of the Above**

**840. A positively skewed distribution is _______****A. Mean > Mode**

B. Mode > Mean

C. Median > Mean

D. None of these