Buses running a bus line near Desdemona's house run every 15 minutes. Without paying attention to the schedule she walks to the nearest stop to take the bus to town.
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This is poisson distribution with lambda =15
P(x>10)= 1-P(x<10)= 1-.1185 =.8815
How did you come up with the number .1185?
I got that from excel =Poisson.dist(10,15,true)
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