Extracted text: An angle was measured by ten different observers. The mean of each set and its probable error is shown below. Determine the most probable value of the angle. Mean Angle PE Observer 1 6 53 36 1.1 2 53 32 0.5 3 6 53 33 0.6 4 53 35 0.9 6. 53 34 1,2 6 53 37 1,3 7 6 53 38 1.4 8 53 31 1.0 6 53 29 1.0 10 53 30 0.9