How many degrees of freedom are there?

Anthropologists can estimate the birthrate of an ancient society by studying the age distribution of skeletons found in ancient cemeteries. An article in the journal Current Anthropology presented the following numbers of skeletons of various ages found at two such sites.

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Ages of Skeletons 0-4 5-19 20 Years Site Years Years or More Casa da Moura 27 61 126 Wandersleben 38 60 118