Lesson Materials

Lesson 5-5, Determining Sample Space

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6.20 The student will
a) make a sample space for selected experiments and represent it in the form of a list, chart, picture, or tree diagram, and
b) determine and interpret the probability of an event occurring from a given sample space and represent the probability as a ratio decimal or percent, as appropriate for the given situation.

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There are 40 people in a room. They shake each other's hands once and only once. How many handshakes are there altogether?
You might try acting this out with a smaller group of people, maybe 10 or so, and looking for a pattern