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Suppose taxi fare from Logan Airport to downtown Boston is known to be normally distributed with...

Suppose taxi fare from Logan Airport to downtown Boston is known to be normally distributed with a standard deviation of $2.50. The last seven times John has taken a taxi from Logan to downtown Boston, the fares have been $22.10, $23.25, $21.35, $24.50, $21.90, $20.75, and $22.65. Construct a 90% confidence interval for the population mean taxi fare?

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