GGR270H1 Lecture Notes - Lecture 5: Standard Score, Normal Distribution, Put On

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11 Dec 2012
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Understanding of the chances of something happening. Probability focuses on the occurence of an event or not happening. Where one of several possible outcomes could result. Outcome are (and must be) mutually exclusive. Can be thought of as frequency of an event occuring relative to all other outcomes. P(a) = probability of outcome a occuring. P(6) = 1/6 or 1 in 6 or 0. 167 (if you multiply 0. 167 by 100 = 16. 7 % chance) Same probability exists for each of the other outcomes too. Examine the record of wet and dry days over a 100 day period. What is the probability of a wet day occuring/ P(wet) = # of wet days/ total # of days = 38/100 = . 38. Can also say 38% chance a wet day will occur. Alternatively, probability of a dry day occuring is Can also say 62% chance to get dry days. Maximum probability of an outcome is 1. 0.

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