REVISION 1. Find the mean of the following data. (a) 9, 7, 11, 13, 2, 4, 5, 5 (b) 16, 18, 19, 21, 23, 23, 27, 29, 29, 35 Find the mean of the following distribution. (a) The age of 20 boys in a locality is given below. Age in Years Number of Boys 12 5 10 3 15 2 14 6 8 4 (b) Marks obtained by 40 students in an exam are given below. Marks Number of Students 25 8 30 12 15 10 20 6 24 4 (c) xi fi 1 4 2 5 3 8 4 10 5 3 (d) The daily wages of 50 employees in an organization are given below: Daily wages (in $) Number of Workers 100 - 150 12 150 - 200 13 Find the mean daily wages. Find the mode of the following data. (a) 12, 8, 4, 8, 1, 8, 9, 11, 9, 10, 12, 8 (b) 15, 22, 17, 19, 22, 17, 29, 24, 17, 15 (c) 0, 3, 2, 1, 3, 5, 4, 3, 42, 1, 2, 0 200 - 250 17 250 - 300 8 (d) 1, 7, 2, 4, 5, 9, 8, 3 8. The runs scored in a cricket match by 11 players is as follows: 7, 16, 121, 51, 101, 81, 1, 16, 9, 11, 16 Find the mean, mode, median of this data. Find the median of the following data. (a) 27, 39, 49, 20, 21, 28, 38 (b) 10, 19, 54, 80, 15, 16 (c) 47, 41, 52, 43, 56, 35, 49, 55, 42 Find the missing number 28, ?, 9, 17, when average(mean) is 17 ? Find the missing number 12, 18, ?, 5, when average(mean) is 13 ? Find the missing number 15, 2, 10, ?, when average(mean) is 9 ? Find the missing number 5, ?, 12, 12, when average(mean) is 10 ?