A container contains a large unspecified number of ping-pong balls. A student takes 80 balls from the container, marks them with a blue dot, returns the marked balls to the container, and thoroughly mixes the balls. She then takes 80 balls again from the container. Of these, 16 have blue dots. She now wants to use this data to estimate the total number of ping-pong balls in the container.The best estimate for the percentage of ping-pong balls in the container that are marked is
A. 15%.
B. 5%.
C. 10%.
D. 20%.
E. none of these
Answer: D
Mathematics
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A.
B.
C.
D.
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