MATH 2311 Section 2.3. Basic Probability Models The probability of any outcome of a random phenomenon is the proportion of times the outcome would occur.

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Presentation transcript:

MATH 2311 Section 2.3

Basic Probability Models The probability of any outcome of a random phenomenon is the proportion of times the outcome would occur in a very long series of repetitions. The sample space of a random phenomenon is the set of all possible outcomes. An event is an outcome or a set of outcomes of a random phenomenon. It is a subset of the sample space. A simple event is an event consisting of exactly one outcome.

Computing Probability To compute the probability of some event E occurring, divide the number of ways that E can occur by the number of possible outcomes the sample space, S, can occur:

Basic Rules of Probability

Examples (Popper 1: EMCF 1): Suppose we draw a single card from a deck of 52 fair playing cards. 1. What is the probability of drawing a heart? a. 1/52b. 1/13c. ¼d What is the probability of drawing a queen? a. 1/52b. 1/13c. ¼d. 0

Examples: If 5 marbles are drawn at random all at once from a bag containing 8 white and 6 black marbles, what is the probability that 2 will be white and 3 will be black?

Examples: The qualified applicant pool for six management trainee positions consists of seven women and five men. a.What is the probability that a randomly selected trainee class will consist entirely of women? b. What is the probability that a randomly selected trainee class will consist of an equal number of men and women?

Examples: A sports survey taken at UH shows that 48% of the respondents liked soccer, 66% liked basketball and 38% liked hockey. Also, 30% liked soccer and basketball, 22% liked basketball and hockey, and 28% liked soccer and hockey. Finally, 12% liked all three sports. a. What is the probability that a randomly selected student likes basketball or hockey? Solve this by also using an appropriate formula.

Examples: A sports survey taken at UH shows that 48% of the respondents liked soccer, 66% liked basketball and 38% liked hockey. Also, 30% liked soccer and basketball, 22% liked basketball and hockey, and 28% liked soccer and hockey. Finally, 12% liked all three sports. b. What is the probability that a randomly selected student does not like any of these sports?