Which of the following statements about the arithmetic mean is not always correct?
选项:
A:The mean is a measure of the middle (centre) of a distribution.
B:Half of the observations are on either side of the mean.
C:The sum of the deviations from the mean is zero.
D:The value of the mean times the number of observations equals the sum of all of the observations.
发布时间:2024-05-21 13:54:59