IB skill practice

Use discrete probability distributions

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

Paper 1, Paper 2 5 marks Difficulty 4

Use discrete probability distributions - context restriction

A eco-tour operator random variable has \(P(X=0)=0.14\), \(P(X=1)=0.25\), \(P(X=2)=0.34\), and \(P(X=3)=0.27\). 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.