Darrin Wright
ITT 650
Due: Semptember 11,2011
Chapter 2 Key Points
Chapter 2 discusses probability, statistics, and traffic theories. Its main purpose is to
understand the basics of traffic patterns. The two types of random variables are the discrete and
continuous. The difference between the two variables is that continuous is pdf defined and
discrete is pdf or pmf defined.
For a discrete random variable, the CDF is found by summing up
the probability using the given sigma notation. The continuous random calculates the CDF by
using the integral of is pdf. .
The expected value of a random variable is the average value of that variable. It
summarizes the distribution of the variable. The variance of the random variable gives an idea of
how wide of short the ranges of the values are.
The number of events that occur in a certain time
interval is called a poisson distribution. The number of trials it takes to reach firs success is
known as the geometric distribution. Normal distribution should be capable of assuming any real
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This note was uploaded on 11/22/2011 for the course ITT 650 taught by Professor Zeng during the Fall '11 term at N.C. A&T.
 Fall '11
 Zeng

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