分) An angle is observed repeatedly using the same equipment and procedures: 23°30'00%, 23°29'40", Most 23°30'15", 23°29'50", 23°30'05", 23°29'55". Calculate (a) the angle's most probable value, (b) the standard deviation of the observation, and (c) the standard deviation of the mean. (30 points) 6Th 177'165