6. Calculate S.D from the following series Class interval 5-15 15-25 25-35 35-45 45-55 Frequency 8. 12 15 7. Find out which of the following batsmen is more consistent in scoring. Batsman 7. 16 27 39 53 56 61 80 101 105 Batsman 4 16 21 41 43 57 78 83 93 95 B Particulars regarding the income of two tutors are given below: Tutor B 8. Tutor A Number of people 600 500 Average income 175 186 Variance of income 100 81 In which village is the variation in income greater