Fifteen Smart Cars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all Smart Cars? Select one: O 47 t1.761 V15 O 47 t1.645 T5 O 47 t1.753T5 O 47 +1345

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