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When throwing a dart at a square board, the probability of getting 10 points or 0 points can be determined using geometric probability. This example explores the probabilities and provides a guided practice exercise.
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Darts You throw a dart at the square board shown. Your dart is equally likely to hit any point inside the board. Are you more likely to get 10 points or 0 points? Area of smallest circle P(10 Points) = Area of entire board π 32 9π π 0.0873 = = = 182 324 36 EXAMPLE 5 Find a geometric probability SOLUTION
Area outside largest circle P(0 points) = Area of entire board 182 – (π 92) = 182 324 – 81π = 324 4 – π = 4 0.215 Because 0.215 > 0.0873, you are more likely to get 0 points. ANSWER EXAMPLE 5 Find a geometric probability
What If?In Example 5, are you more likely to get 5 points or 0 points? Because 0.2616 > 0.215, you are more likely to get 5 points. ANSWER for Example 5 GUIDED PRACTICE
Area outside largest circle P(0 points) = Area of entire board 182 – (π 92) = 182 324 – 81π = 324 4 – π = 4 0.215 Because 0.2616 > 0.215, you are more likely to get 5 points. ANSWER EXAMPLE 5 Find a geometric probability