IB skill practice

Use expectation and variance rules

Use linearity of expectation and variance rules for transformed or combined variables.

Paper 1, Paper 2 5 marks Difficulty 4

Use expectation and variance rules - calculation checkpoint

For a scholarship office decision score, \(E(X)=17\) and \(E(Y)=6\). If \(S=2X-Y\), find \(E(S)\). Enter the requested value and choose the interpretation that matches the result.

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