Which Statement Concerning the Semi-Averages Method Is NOT Correct

Which statement concerning the semi-averages method is NOT correct?

A) Both the lower and upper groups should have the same number of data points
B) Mean values for the lower and upper groups are plotted against the median value of the group
C) Data should be arranged in order of size from smallest to largest data point
D) If the data set contains an odd number of points the middle point should be ignored

Correct Answer:

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