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4. Speed checks on a highway are normally distributed. 10% of cars have a speed more than 132.8 km/hr and 7% of cars have a

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4. Speed checks on a highway are normally distributed. 10% of cars have a speed more than 132.8 km/hr and 7% of cars have a speed less than 103.2 km/hr. a) Calculate the mean and standard deviation speed of the car. /5 b) Find the probability that the speed registered is within 3 km of the mean. /2

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