Add each of the following and check by reversing the order of addends: `1+2+3+4+1996+1997+1998+1999` `10+11+12+13+14+15+16+17+18+19+20`

The mode of given data 15, 14, 19, 20, 14, 15, 16, 14, 15, 18, 14, 19, 15, 17 and 15 is

Prepare a frequency table of the following ages (in years) of 30 students of class VIII in your school: 13, 14, 13, 12, 14, 13, 14, 15, 13, 14, 13, 14, 16, 12, 14 13, 14, 15, 16, 13, 14, 13, 12, 17, 13, 12, 13, 13, 13, 14

Prepare a frequency table of the following ages (in years) of 30 students of class VIII in your school: 13, 14, 13, 12, 14, 13, 14, 15, 13, 14, 13, 14, 16, 12, 14 13, 14, 15, 16, 13, 14, 13, 12, 17, 13, 12, 13, 13, 13, 14

Write each of the following sets in set- builder form : A = { 4,6, 8 , 9, 10 , 12, 14, 15, 16, 18}

Find the mode in each of the following data collection. d. 12, 13, 12, 15, 16, 16, 13, 12, 14, 18, 12, 12, 14, 15, 19, 12, 14

Find the mode of the following data in each case: 14, 25, 14, 28, 18, 17, 18, 14, 23, 22, 14, 18 7, 9, 12, 13, 7, 12, 15, 7, 12, 7, 25, 18, 7

Find the mean deviation about the median for the data : 13 , 17 , 16 , 14 , 11 , 13 , 10 , 16 , 11 , 18 , 12 , 17

The distance (in km) of 40 engineers from their residence to their place of work were found as follows: "5 3 10 20 25 11 13 7 12 31 19 10 12 17 18 11 32 17 16 2 7 9 7 8 3 5 12 15 18 3 12 14 2 9 6 15 15 7 6 12" Construct a grouped frequency dist

Construct a frequency table for the following ages (in years) of 30 students using equal class intervals, one of them being 9-12, where 12 is not included. 18, 12, 7, 6, 11, 15, 21, 9, 8, 13, 15, 17, 22, 19, 14, 21, 23, 8, 12, 17, 15, 6, 18, 23, 22, 16, 9, 21, 11, 16.

The distances (in km) of 30 female engineers from their residence to their place of work were found as follows: 5 3 10 20 25 11 13 7 12 31 19 10 12 17 18 11 32 17 16 2 12 14 2 9 6 15 15 7 6 2 Find the probability that an engineer lives: (i) less than 7 km from her place of work? (ii) at least 7km from her place of work? (iii) within 1/2k m from her place of work? (iv) at most 15km from her place of work?