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Die aankomstyd tussen opeenvolgende motors by ’n spesifieke kruising volg ’n eksponensiaalverdeling met ’n gemiddeld van twaalf sekondes. / The time between arrivals of two consecutive vehicles at a particular intersection follows an exponential distribution with a mean of twelve seconds.
Bereken die variansie van die aankomstyd tussen twee opeenvolgende motors. / Calculate the variance of the arrival time between two consecutive vehicles.
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