{\text{A matrix is a rectangular array of }}\_\_\_\_\_\_\_\_\_\_\_\_\_.

• A) numbers
• B) palces
• C) objects
• D) symbols

The matrix A = \left[ {\begin{array}{*{20}{c}} 1 \\ 5 \\ {10} \end{array}} \right] is a _________ matrix.

• A) singular
• B) null
• C) row
• D) column

\begin{array}{l} Dimension\,\,of\,\,matrix\,\,A\,\,is\,\,3*3\,\,\,and\,\,Dimension\,\,of\,\,matrix\,\,B\,\,is\,\,3*2\,\,\,. \\\ Find\,\,the\,\,Dimension\,\,of\,\,AB\,\,\, = \,\,\,\,\, - - - - - . \\\ \end{array}

• A) 2*2
• B) None\,\,of\,\,these
• C) 3*2
• D) 3*3

\({\text{If }}2:x = 3:9\,{\text{ then}}\,\,x = \_\_\_\_\_\_\_\_\_\_\_\_\_.\,\)

• A) \(12\)
• B) \(3\)
• C) \(6\)
• D) \(9\)

{\text{If}}\,\sum {fX} = 340\,\,{\text{and}}\,\,\,\sum f = 20\,\,\,{\text{then}}\,\,\bar X = \_\_\_\_\_\_\_\_\_\_.

• A) 17
• B) 360
• C) 7800
• D) 320

{\text{If}}\,\,\,{\sum {{W_i}X} _i} = 4900\,\,\,{\text{and}}\,\,\,\sum {{W_i}} = 70\,\,\,\,{\text{then}}\,\,\,{{\bar X}_w} = \_\_\_\_\_\_\_\_\_\_.

• A) 70
• B) 5060
• C) 343000
• D) 5830

\({\text{If}}\,\,\,{\sum {{W_i}X} _i} = 4900\,\,\,{\text{and}}\,\,\,\sum {{W_i}} = 70\,\,\,\,{\text{then}}\,\,\,{{\bar X}_w} = \_\_\_\_\_\_\_\_\_\_.\)

• A) 343000
• B) 70
• C) 5060
• D) 5830

\({\text{In}}\,{\text{the}}\,{\text{given}}\,{\text{formula}}\,{\text{ }}\hat X = l + \frac{{{f_m} - {f_1}}}{{({f_m} - {f_1}) + ({f_m} - {f_2})}} \times h,{\text{ }}{f_2} = \_\_\_\_\_\_\_\_\_\_.\)

• A) frequency of the modal class
• B) frequency of the class following the modal class
• C) frequency of the class preceding the modal class
• D) cumulative frequency

\({\text{If}}\,\,\sum {wx = 2700\,\,{\text{and}}\,\,\sum {w\, = \,300\,\,{\text{then}}\,\,{\text{the}}\,\,{\text{weighted}}\,\,{\text{mean}}\,\,\_\_\_\_\_\_\_\_\_.} \,\,\,} \)

• A) 11
• B) 6
• C) 9
• D) 5

\({\text{If}}\,\sum {fX} = 340\,\,{\text{and}}\,\,\,\sum f = 20\,\,\,{\text{then}}\,\,\bar X = \_\_\_\_\_\_\_\_\_\_.\)

• A) 17
• B) 320
• C) 7800
• D) 360

\({\text{If}}\,\,\sum {f\,x = 1135.5\,\,{\text{and}}\,\,\sum {f\, = \,30\,\,{\text{then}}\,\,{\text{the}}\,\,{\text{weighted}}\,\,{\text{mean}}\,\,\_\_\_\_\_\_\_\_\_.} \,\,\,} \)

• A) 37.85
• B) 39.50
• C) 35.89
• D) 38.60

{\text{If}}\,\,\sum {f\,x = 1135.5\,\,{\text{and}}\,\,\sum {f\, = \,30\,\,{\text{then}}\,\,{\text{the}}\,\,{\text{weighted}}\,\,{\text{mean}}\,\,\_\_\_\_\_\_\_\_\_.} \,\,\,}

• A) 37.85
• B) 35.89
• C) 39.50
• D) 38.60

{\text{In}}\,{\text{the}}\,{\text{given}}\,{\text{formula}}\,{\text{ }}\hat X = l + \frac{{{f_m} - {f_1}}}{{({f_m} - {f_1}) + ({f_m} - {f_2})}} \times h,{\text{ }}{f_m} = \_\_\_\_\_\_\_\_\_\_.

• A) frequency of the class preceding the modal class
• B) cumulative frequency
• C) frequency of the class following the modal class
• D) frequency of the modal class

{\text{If}}\,\,\sum {wx = 2700\,\,{\text{and}}\,\,\sum {w\, = \,300\,\,{\text{then}}\,\,{\text{the}}\,\,{\text{weighted}}\,\,{\text{mean}}\,\,\_\_\_\_\_\_\_\_\_.} \,\,\,}

• A) 5
• B) 9
• C) 11
• D) 6

\({\text{In}}\,{\text{the}}\,{\text{given}}\,{\text{formula}}\,{\text{ }}\hat X = l + \frac{{{f_m} - {f_1}}}{{({f_m} - {f_1}) + ({f_m} - {f_2})}} \times h,{\text{ }}{f_m} = \_\_\_\_\_\_\_\_\_\_.\)

• A) cumulative frequency
• B) frequency of the modal class
• C) frequency of the class preceding the modal class
• D) frequency of the class following the modal class

{\text{In}}\,{\text{the}}\,{\text{given}}\,{\text{formula}}\,{\text{ }}\hat X = l + \frac{{{f_m} - {f_1}}}{{({f_m} - {f_1}) + ({f_m} - {f_2})}} \times h,{\text{ }}{f_2} = \_\_\_\_\_\_\_\_\_\_.

• A) cumulative frequency
• B) frequency of the modal class
• C) frequency of the class preceding the modal class
• D) frequency of the class following the modal class