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19. Assume the speed of vehicles along a stretch of I- it} has an approximately normal distribution with a mean of 7'] mph and a

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19. Assume the speed of vehicles along a stretch of I- it} has an approximately normal distribution with a mean of 7'] mph and a standard deviation of 3 mph. (i) The current speed limit is 65 mph. What is the proportion of vehicles less than or equal to the speed limit? (ii) What proportion of the Taehieles would be going more than 80 mph

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