Among US cities with a population of more than 250,000, the median commute time to work is 24.3 minutes. The longest travel time belongs to New York City, where the average time is 38.3 minutes. Suppose that The distribution of travel times in New York City has a normal probability distribution and the standard deviation is 7.5 minutes. µ = 38.3 min. σ = 7.5 min. a) What percentage of trips in New York City consume less than 30 minutes? p(x ≤ 30) b) What percentage of trips consume between 30 and 35 minutes? p(30 ≤ x ≤ 35) c) What percentage of trips consume between 30 and 40 minutes? p(30 ≤ x ≤ 40)

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Among US cities with a population of more than 250,000, the median commute time to work is 24.3 minutes. The longest travel time belongs to New York City, where the average time is 38.3 minutes. Suppose that
The distribution of travel times in New York City has a normal probability distribution and the standard deviation is 7.5 minutes.

µ = 38.3 min.
σ = 7.5 min.

a) What percentage of trips in New York City consume
less than 30 minutes?
p(x ≤ 30)

b) What percentage of trips consume between 30 and 35 minutes?
p(30 ≤ x ≤ 35)

c) What percentage of trips consume between 30 and 40 minutes?
p(30 ≤ x ≤ 40)

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