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The average speed of all cars passing through a certain road is unknown. The following data refers to the speed, measured in miles/hour, for a

The average speed of all cars passing through a certain road is unknown. The following data refers to the speed, measured in miles/hour, for a sample of 9 cars passing through the road on a given day.

49 52 57 45 55 47 44 43 39

It is assumed that the speed of cars follows a normal distribution. Find a 95% confidence interval of mean speed of all cars passing through the road.

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