Question

A bag contains 7 blue marbles and 28 orange marbles. If a representative sample contains 3 blue ​marbles, then how many orange marbles would you expect it to​ contain? Explain.
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Part 1
Because the ratio of blue marbles to orange marbles is
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in the​ population, the expected number of orange marbles is
  
enter your response here times the number of blue marbles in the representative sample. There should be
  
enter your response here orange marbles.

Answer 1

Because the ratio of blue marbles to orange marbles is 7:28 = 1:4 in the population, the expected number of orange marbles is 4 times the number of blue marbles in the representative sample. There should be 3 × 4 = 12 orange marbles.