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Like the duplicate says, it is not literally 2.2 kids- It is not 2 kids who have a status 10% better. It is an average for the country. And this place was so stereotypically ideal that they each had the exact average number of kids. (Not really- it is a joke.)
A similar phenomenon in the USA (and not related to southern Indian cuisine): There are restaurants called “ X Inn” or “Inn at Y” that have nary a room for rent.