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An urn contains \(30\pourcent\) of black marbles and \(70\pourcent\) of white marbles. We draw three samples of size \(n=10\).
  • Sample 1: 4 black marbles.
  • Sample 2: 2 black marbles.
  • Sample 3: 3 black marbles.
  1. Calculate the observed frequency \(f\) of black marbles for each sample.
  2. Name the phenomenon illustrated by these results.

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