(1,3);(5,7,9,+1);(13,15,17,19,21,23)

The sum of numbers in the n^(th) group of the following (1,3),(5,7,9,11),(13,15,17,19,21,23),...

The odd numbers are divides as follows : {:(,,1,3,,),(,5,7,9,11,),(13,15,17,19,21,23):} "…………………………………………………….." then the sum of nth row is :

Estimate mean deviation and its coefficient from the following data: 7,9,13,13,15,17,19,21,23

The inter - quartile range of the data 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

The marks obtained by 40 students of class VIII in an examination are given below: 16,17,18,3,7,23,18,13,10,21,7,1,13,21,13,15,19,24,16,3, 23,5,12,18,8,12,6,8,16,5,3,5,0,7,9,12,20,10,2,23 Divide the data into five groups, namely 0-5, 5-10, 10-15, 15-20 and 20-25 and prepare a grouped frequency table.

The marks obtained by 40 students of class VIII in an examination are given below: 16,17,18,3,7,23,18,13,10,21,7,1,13,21,13,15,19,24,16,3, 23,5,12,18,8,12,6,8,16,5,3,5,0,7,9,12,20,10,2,23 Divide the data into five groups, namely 0-5, 5-10, 10-15, 15-20 and 20-25 and prepare a grouped frequency table.

Calculate the covariance of observation (3,5), (6,7),(9,9), (12,11), (15,13), (18,15), (21,17), (24, 19) using assumed mean A = 13 and B = 12.

Find the sum upto the nth term of the series (1+3) + (5+7+9+11) + (13 +15+17+19+21+23)+… .

Find the median of the numbers given below 13,17,17,19,25,23,19,17,19,13,19,17,13,23