IB Maths AI HL SL 4.7 Discrete random variables
IB Maths AI HL SL 4.7 Discrete random variables
Students practise calculating expected value E(X) from discrete probability distributions, interpreting it as long-run average, and applying it in compound contexts.
How this is tested
- calculate E(X) = ΣxᵢP(X = xᵢ) from a given probability distribution table
- interpret the product of expectations when the variables are independent
- use E(X) to compare options—e.g., choose higher expected winnings even with risk of zero payout