Please write clearly in block capitals. Centre number Candidate number Surname _________________________________________________________________________ Forename(s) _________________________________________________________________________ Candidate signature _________________________________________________________________________ I declare this is my own work. 2 Do not write outside the box (02) G/Jun24/7367/3S Answer all questions in the spaces provided. 1 The random variable X has a Poisson distribution with mean 16 Find the standard deviation of X Circle your answer. [1 mark] 4 8 16 256 2 The random variable T has an exponential distribution with mean 2 Find P(T ≤ 1.4) Circle your answer. [1 mark] e–2.8 e–0.7 1 – e–0.7 1 – e–2.8 3 Do not write outside the box (03) G/Jun24/7367/3S Turn over U 3 The continuous random variable Y has cumulative distribution function F(y) = 0 y < 2>