Question

A bag contains 8 red marbles and 48 yellow marbles. If a representative sample contains 3 red ​marbles, then how many yellow marbles would you expect it to​ contain? Explain.
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Part 1
Because the ratio of red marbles to yellow marbles is
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in the​ population, the expected number of yellow marbles is
  
enter your response here times the number of red marbles in the representative sample. There should be
  
enter your response here yellow marbles.

Answer 1

Because the ratio of red marbles to yellow marbles is 8:48 = 1:6 in the population, the expected number of yellow marbles is 6 times the number of red marbles in the representative sample. There should be 6 × 3 = 18 yellow marbles.