IB skill practice

Transform variances

Use variance transformation rules under scaling.

Paper 1, Paper 2 5 marks Difficulty 5

Transform variances - exam scenario

For a regional clinic random variable, \(\operatorname{Var}(X)=12\). If \(Y=5X+5\), find \(\operatorname{Var}(Y)\). Confirm the context meaning before entering the value. Enter the requested value and choose the interpretation that matches the result.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.