Answered: Among US cities with a population of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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)

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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