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A month-long traffic study of Interstate 89 in Western Ohio finds that drivers drive an average of M = 75 mph with s = 9

A month-long traffic study of Interstate 89 in Western Ohio finds that drivers drive an average of M = 75 mph with s = 9 between Interstate 90 and Interstate 80

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a) What proportion of the sample drove less than 78 mph?

b) What proportion of the smaple drove less than 68 mph?

c) What proportion of the sample drove between 66 mph and 78 mph?

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