Past exam of the mathematics course of the University of Cambridge 2022 ib Paper 1 18H b Solution Created 2026-09-24 Updated 2026-09-25
The probability of no recovery through month is the product of the conditional survival probabilities, soUnder quadratic loss, the Bayes estimator is the posterior mean. Posterior independence and the mean of a Beta distribution giveConsequently
For independent and identically distributed random variables with continuous distance distribution function , the probability integral transform makes the probability content of the order- nearest ball a uniform order statistic, with the Beta distribution .
Uniform prior Created 2026-10-05 Updated 2026-10-06
A uniform prior on a finite-volume parameter region assigns constant probability density there and zero outside. On it is , giving a Beta distribution posterior after binomial distribution data. Uniformity depends on the coordinate: a nonlinear reparametrization introduces a Jacobian and generally does not preserve a uniform density.
With independent uniform types, equal prizes of scale and unit effort costs, a symmetric Bayesian Nash equilibrium has total expected effort . The all-pay effort identity yields . The allocation derivative is a Beta distribution density with parameters , so integration gives the formula.