Each question carries 15 marks. 2. Calculate mode from the following. Marks (Above) 0 10 20 30 40 50 60 70 80 No of students 122 118 112 92 60 27 10 2 0 23. Calculate co-efficient of variation from the following data. Class 90-99 80-89 70-79 60-69 50-59 40-49 30-39 Frequency 2 12 22 20 14 4 24. Calculate standard deviation of the distribution of wages mentioned below: Monthly wages 130-150 150-170 170-190 190-210 210-230 No of Persons 8 26 59 43 14 25. The observed values of a function are respectively 168, 120, 72 and 63 at the four positions 3,7,9 and 10 of the independent variable. What is the best estimate you can give for the value of the function at the position 6 of the independent variable? (2x15=30)