The numbers which are the means of the proportion as given in the task content are in; Choice D; 3 and 20
It follows from the task content that the proportion whose mean is to be evaluated in the task content is; 2/3 = 20/30.
On this note, it follows that the numbers 2 and 30 are the lower and upper extremes of the property and hence, 3 and 20 are the mean of the proportion.
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