MATH 120 Lecture 14: Chapter 7.4 Concepts in Probability
Document Summary
The compliment rule helpsus determine other outcomes when we don"t want a specific one. The equation is p(e) = 1 - p(e"). E" is the event that we do not want. So, we first determine the event that we do want, which is anything but a 3. Now, we consider the event that we do not want, which is a. Plug into the equation the number of outcomes that we don"t want. The probability that we don"t get a sum of 3 is 5. The odds - in - favor rule helps us determine an exact probability. The odds - in - favor of an event e is m:n. This converts to the equation p(e) = m m+n. Convert the odds -in -favor of a horse winning, which is 5:23, to probability. m:n = 5:23 m = 5 n = 23. Now, just plug it into the equation. m m+n (5) (5) +(23)
