Sentence:  Determine for each State ( except the Virgin Islands , Guam and Puerto Rico , and , prior to 1962 , Alaska and Hawaii ) that percentage which bears the same ratio to 50 % as the particular State 's <WSD>average</WSD> per capita income bears to the average per capita income of the U. S. . 
Meaning of the word marked with <WSD> tags:  approximating the statistical norm or average or expected value