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A shopkeeper records their daily profit \(X_i\) for each day \(i\) of a 5-day work week (\(i=1,2,3,4,5\)).
  1. Give the expression for the random variable \(S_5\) representing the total profit for the week.
  2. Give the expression for the random variable \(\overline{X}_5\) representing the average daily profit for that week.

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