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Answer:
i believe that it is 3.5.... don't quote me on that
STEP BY STEP
all i did was add up people per residence which came out to 21 and divided it by 6 because thats how many rows there are and it came to 3.5!
P.S
i know that happygey7279 is wrong because i put that for my answer on edge and it was wrong... someone let me know if 3.5 is right...