DATA MANAGEMENT

Mean 1. Find the mean ofthe first five natural numbers, using the mean formula. 2. The marks obtained by 6 students in a class test are 20, 22, 24, 26, 28, 30. Find the mean. 3. A proof reads through 73 pages' manuscript The number of mistakes found on each of the pages are summarized in the table below Determine the mean number of mistakes found per page No of l 2 3 4 5 6 7 mistakes No of pages 5 9 12 l7 l4 l0 6 Median 1. Consider the following scores in an activity in statistics; 75.5, 97, 95.5, 100, 93.3, 66.7, 92, 75.5, 73.3, 85.6 2. The ages of the members of a community center have been listed below: {42, 38, 29, 37,40, 33, 41}. Calculate the median of the given data. 3. x is the median for 4, 3, 8, x and 7. Find the possible values for x. 4. The following data represents the survey regarding the heights (in cm) of 51 girls of Class x. Find the median height; where number of girls is cf. Height (in cm) Number of Girls Less than 140 4 Less than 145 11 Less than 150 29 Less than 155 40 ' Less mag 46 Less than 165 51 5. The following is the marks obtained by 140 students in a college. Find the median marks ' Number of Marks students 10-19 7 2029 15 3039 13 40-49 25 50-59 30 60-69 20 70-79 16 80-89 7 9099 2 Mode 1. Find the mode oi the given data set: 3' 3, 6. 9. 15.15.15, 27, 27, 37, 48. 2. The following table represents the number of wickets taken by a bowler In 10 matches. Find the mode of the given set of data. Match No. 1 2 3 4 S 6 7 ' a 9 10 No. ofWickets 2 1 1 3 2 3 2 2 4 1 3. Compute mode value for the following observations: 2, 7, 10, 12, 10, 19, 2, 11, 3, 12 4. The foi10wing data relates to the daily income of families in an urban area. Find the modal income of the families. income (') 0-100 100-200 200-300 300-400 400-500 500600 600-700 No.0f persons 5 7 l2 18 I6 ID 5 5. in a class ol30 student's marks obtained by students in mathematics out olSO is tabulated as below. Calculate the mode of data given. Merits Obtained Number of student Variance 1. Find the sample mean, variance and standard deviation of the following scores on an exam: 92, 95, 85, 80. 75, 50. 2. Find me variance of the following data. Observation 7 29