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Among the thirty largest U.S. cities, the mean one-way commute time to work is 25.8 minutes....

Among the thirty largest U.S. cities, the mean one-way commute time to work is 25.8 minutes. The longest one-way travel time is in New York City, where the mean time is 37.9 minutes. Assume the distribution of travel times in New York City follows the normal probability distribution and the standard deviation is 6.9 minutes.

What percent of the New York City commutes are for less than 29 minutes?

What percent are between 29 and 35 minutes?

What percent are between 29 and 42 minutes?

Math   Statistics-And-Probability   
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