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M119L09to10-page9

M119L09to10-page9 - “even” and “5” on the same...

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(Lesson 10: Addition Rule; 4-3) 4.09 LESSON 10: ADDITION RULE (SECTION 4-3) Example 1 Roll one die. Easiest approach: P even Event A or 5 Event B = 4 6 = 2 3 Here, events A and B are disjoint, or mutually exclusive events (we’ll say “mees”) in that they can’t both happen together. If one event occurs, it excludes the possibility that the other event can also occur with it. Here, a die can’t come up
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Unformatted text preview: “even” and “5” on the same roll (i.e., for the same trial). Addition Rule for Mees If events A and B are mees, then P A or B ( ) = P A ( ) + P B ( ) . Here, P even or 5 ( ) = P even ( ) + P 5 ( ) = 3 6 + 1 6 = 4 6 = 2 3...
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