DeNegre Lab 2_Probability

# DeNegre Lab 2_Probability - Lab 2 Principles of Probability...

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Lab 2 - Principles of Probability

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Some key terms: An event provides a set of outcomes (e.g., tossing a coin, rolling a die) An outcome is the result of the event (e.g., a head, a six) Probability = # outcomes fitting your description # outcomes deemed possible Some examples: P (head in coin flip) = 1/2 P (6 in die roll) = 1/6 [P(1 to 5) = 5/6] P (boy from fertilization) = 1/2 P (king in card deck) = 4/52 = 1/13
Addition Rule “What is the probability that Event A OR Event B will happen?” = Probability of Event A + Probability of Event B Multiplication Rule “What is the probability that Event A AND Event B will happen?” = Probability of Event A x Probability of Event B

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When 2 things cannot happen at the same time , they are considered mutually exclusive… Being a boy and being a girl: Mutually Exclusive! Being a freshman and being a junior: Mutually Exclusive! Being a boy and being a junior: NOT Mutually Exclusive! One can be a boy and a junior AT THE SAME TIME! [This can make using the addition rule tricky sometimes….]
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DeNegre Lab 2_Probability - Lab 2 Principles of Probability...

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