As part of a statistics project, a 6th grade teacher brings to class a container with 200 red marbles and 800 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 150 marbles from the container. Of the 150 marbles drawn, 33 are red.The data collection method can best be described as

A. a controlled study.
B. a census.
C. a clinical study.
D. a survey.
E. none of these


Answer: D

Mathematics

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