9:42 In the following table are recorded data showing the test scores made by 10 salesmen on an intelligence test and their weekly sales : Salesmen 1 2 3 4 S 6 7 8 9 10 Test Scores 50 70 50 60 80 50 90 50 60 60 Sales ('000 Rs.) 25 60 45 50 45 20 55 30 45 30 Calculate the rank correlation coefficient between intelligence and efficiency in salesmanship