Lecture6

# Lecture6 - ECE 340 Lecture 6: Random variable Jean Liu...

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ECE 340 Lecture 6: Random variable Jean Liu Email: [email protected]

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Reading • This class: Section 3.1, 3.2,3.3 • Next class: Section 3.3, 3.4
Outline • Random variable – Definition – Notation • Probability mass function (pmf) • Expected value • Samples

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• Temperature in ABQ on Feb. • Length of queue at a movie theater • The number of words in your emails • The color of a car in the street • The side of coin tossed N time • The mood of me today Random experiment
An assignment of a value (number) to every possible outcome Mathematically: A function from the sample space to the real numbers – discrete or continuous Sample space - ζ Sx

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Can have several random variables defined on the same sample space Sample space - ζ Sx - S’x
• Notation: • – random variable X ,Y • – numerical possible value x ,y, •X ( ζ )=x, Y( ζ )=y,

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Example 1 • A coin tossed 3 times. The sequence of heads and tails are noted.
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## This note was uploaded on 02/10/2010 for the course TBE 2300 taught by Professor Cudeback during the Spring '10 term at Webber.

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Lecture6 - ECE 340 Lecture 6: Random variable Jean Liu...

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