Census experts puzzled by high rate of unanswered questionsCensus Bureau statisticians and outside experts are trying to unravel a mystery: Why were so many questions about households in the 2020 census left unanswered? Residents did not respond to a multitude of questions about sex, race, Hispanic background, family relationships and age, even when providing a count of the number of people living in the home, according to documents released by the agency. Statisticians had to fill in the gaps.  Reflecting an early stage in the number crunching, the documents show that 10% to 20% of questions were not answered in the 2020 census, depending on the question and state. According to the Census Bureau, later phases of processing show the actual rates were lower. Mike Schneider | August 9, 2021