SOLUTION: An island has 12 fur seal rookeries (breeding places). To estimate the fur seal pup population in Rookery A, 5758 fur seal pups were tagged in early August. In late August, a sampl

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Question 750299: An island has 12 fur seal rookeries (breeding places). To estimate the fur seal pup population in Rookery A, 5758 fur seal pups were tagged in early August. In late August, a sample of 1100 pups was observed, and 285 of these were found to have been previously tagged. Use a proportion to estimate the total number of fur seal pups in Rookery A.
The estimated total number of fur seal pups in Rookery A is ____. (Round to the nearest whole number.)
Additional instructions: Set up a proportion, and then use the cross products principle of proportions. If a/b=c/d, then ad=bc. Be sure to round to the nearest whole number.

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
(285 tagged seals)/(1100 observed seals) found after the tagged ones during the tagging operation were mixed into the rest of the untagged seals.

Before the tagged seals were put into the collection of untagged seals,
(5758 tagged seals)/(U total seals)
U is the population of seals.

Proportion arranged conveniently: U%2F5758=1100%2F285
U=22200 to the best of possible accuracy.