\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A technician examines a batch of 4 items. Let \(X_i=1\) if item \(i\) is defective and \(X_i=0\) otherwise.
  1. What does the random variable \(S_4=X_1+X_2+X_3+X_4\) represent?
  2. What does the random variable \(\overline{X}_4=\dfrac{S_4}{4}\) represent?

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