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PHYS 245
Aug 8, 2023
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Class #2 PHYS-245 Introduction to Statistical Mechanics and Thermodynamics Dept. of Physics & Astronomy Jan 20th 2023 1
Uncertainty in everyday life 2 Chance of rain Toss a coin, throw a dice Stock reaching a particular price today Surviving a car accident Pick a winning lottery ticket
Events 3 100% certainty P=1 0% certainty P=0 Situation with multiple (finite) outcomes. Event , one of the many possible outcomes Label each outcome by some number (or letter). Ex. for a dice, "1", "2", "3", "4", "5", "6" x a random variable that stores the label of the outcome. Not necessarily a number! P(x) percentage of the time that a particular outcome x occurs, or probability of x . P(x) is a number uncertain P<1
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