Find the s value

41.4 51.7 57.9 60.6 68.0 45.4 54.1 58.4 62.2 68.9 47.5 54 2 59.1 63.3 69.3 49 2 540 59.1 64.3 72.1 49 8 55.0 59.2 64.5 72.8 50.2 55.9 59.2 64.8 75.3 504 56.1 59.3 65.0 82.0 51.1 57.8 60.1 65.2 84.5