The neighborhood census shows that the 10 families in the neighborhood have 2, 4, 3, 2, 2, 1, 3, 4, 1, and 5 children.

What would happen to the mean number of children in a family if a family with 4 children were added to the census?

Without the 4 children: Mean is 2.7 children , Rounded: About 3 children

With the 4 children: Mean is 2.8 children, Rounded: About 3 children

When we add 2 + 4 + 3 + 2 + 2 + 1 + 3 + 4 + 1 + 5 = 27

Divide 27 by 10, and you get 2.7 or about 3

When we add 2 + 4 + 3 + 2 + 2 + 1 + 3 + 4 + 1 + 5 + 4 = 31

Divide 31 by 11, and you get 2.8 or about 3.

The mean goes up about a tenth of the number, or when rounded it stays the same.

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