The mean cost of domestic airfares in the United States rose to an all­time high of $385per ticket (Bureau of Transportation Statistics website, November 2, 2012). Airfares werebased on the total ticket value, which consisted of the price charged by the airlines plusany additional taxes and fees. Assume domestic airfares are normally distributed with astandard deviation of $110.a. what is the probability that a domestic airfare is $550 or more?b. what is the probability that a domestic airfare is $250 or less?c. what is the probability that a domestic airfare is between $300 and $500?

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Q: approximately

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.