As a part of employee improvement programs, every year an organization conducts a survey on three factors: 1. Number of days (in integers) of training undergone, 2. Amount of bonus (in lacs) received by an employee and 3. Employee effectiveness score (on the scale of 1 to 10). Survey results for last two years are given below for the same seven employees. [Charts in source: 1. Employee Effectiveness Scores in Two Surveys (radar chart); 2A. Days of Training Undergone in Two Surveys; 2B. Days of Training vs. Employee Effectiveness Scores; 3A. Bonus Received in Two Surveys; 3B. Bonus Received vs. Employee Effectiveness Scores - see pages 19-21 of source PDF.] Approximate values read from the charts (Survey 1 / Survey 2): Employee | Training days | Bonus (lacs) | Effectiveness score E1 | 17 / 27 | 31 / 35 | 9.2 / 8.5 E2 | 10 / 21 | 27 / 22 | 5.0 / 9.4 E3 | 12 / 15 | 15.3 / 14 | 4.3 / 7.2 E4 | 18 / 9 | 20.3 / 18 | 8.8 / 5.2 E5 | 20 / 18 | 19 / 30 | 8.0 / 6.2 E6 | 15 / 13 | 23 / 25.5 | 6.5 / 7.8 E7 | 13 / 25 | 12 / 17 | 7.2 / 4.0