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Geometry NOTES Date: __________ **PROBABILITY:** a number from 0 to 1 that measures how likely it is that an event will happen. Your answer can be represented by a fraction, decimal, or percent. Some events will never occur, and some events will always occur **P(E):** symbol that represents: “*the probability of the event* *occurring”* number of outcomes possible in "E" Total number of outcomes altogether 1. What is the probability of guessing the correct answer to a True-False question? 2. What is the probability of guessing the correct answer to a multiple choice question if there are 5 choices? 3. The letters “a, e, i, o, u” are vowels. If one letter of the alphabet is chosen at random, what is the probability it is a vowel? 4. If you roll a single die once, what is the probability of rolling a 3? 5.

7. 6.

5. the AREA of the region of the event total AREA of the entire region

9. 8. A circle is inscribed in a square. A point is chosen at random. What is the probability that the point lies in the shaded region? 9. A triangle is inscribed in a square. A point in the square is selected at random. What is the probability that the point lies in the shaded region?