The speeds of vehicles on a highway with speed limit 100km/h are normally distributed with mean 112km/h

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The speeds of vehicles on a highway with speed limit 100km/h are normally distributed with mean 112km/h and standard deviation 8km/h.
(a) What is the probability that a randomly chosen vehicle is traveling at a legal speed?
(b) If police are instructed to ticket motorists driving 125km/h or more, what percentage of motorists is targeted?
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