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Post by MathsTutor4You on Mon Sep 07, 2015 3:50 pm

Patients arrive at a hospital accident and emergency department at random at a rate of 6 per hour.

(a) Find the probability that, during any 90 minute period, the number of patients arriving at the hospital accident and emergency department is

     (i)  exactly 7

     (ii) at least 10

A patient arrives at 11.30 a.m.

(b) Find the probability that the next patient arrives before 11.45 a.m.

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