IB skill practice

Use discrete probability distributions

Calculate probability, expectation, or variance from a discrete distribution.

Paper 1, Paper 2 5 marks Difficulty 3

Use discrete probability distributions - calculation checkpoint

A school canteen random variable has \(P(X=0)=0.14\), \(P(X=1)=0.27\), \(P(X=2)=0.33\), and \(P(X=3)=0.26\). Find \(E(X)\). 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.