41. The arithmetic mean of the two limiting distances is the length of the semi-major axis " a ". 42. Therefore, the median is 4 since it is the arithmetic mean of the middle observations in the ordered list. 43. In elementary schools conduct grades also are not counted in the arithmetic mean while in secondary schools they are. 44. Because of this the usual sample mean ( arithmetic mean ) is a biased estimator of the true mean. 45. For real numbers, the arithmetic mean is a Fr�chet mean, using the usual Euclidean distance as the distance function. 46. :2 ) A weighted arithmetic mean is useful when some data points need to be weighted more than others. 47. It is more apparent that the harmonic mean is related to the dual of the arithmetic mean for positive inputs: 48. "Average " is the arithmetic mean ; " median " is the figure in the middle of the series of numbers. 49. Since the variance is always e " 0 the contraharmonic mean is always greater than or equal to the arithmetic mean . 50. In this case, the arithmetic mean of the two middlemost terms is ( 2 + 6 ) / 2 = 4.
