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Lesson 1-3 Example 4 1-3 Solve. The ratio of brown-eyed students to the total number of students in a sixth-grade class is 24 out of 40. What is the probability.

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Presentation on theme: "Lesson 1-3 Example 4 1-3 Solve. The ratio of brown-eyed students to the total number of students in a sixth-grade class is 24 out of 40. What is the probability."— Presentation transcript:

1 Lesson 1-3 Example 4 1-3 Solve. The ratio of brown-eyed students to the total number of students in a sixth-grade class is 24 out of 40. What is the probability if one student is picked by the teacher without looking that the student will not have brown eyes? UnderstandRead the problem. Write what you know. Out of 40 students, 24 have brown eyes.

2 Lesson 1-3 Example 4 1-3 PlanPick a strategy. One strategy is to use logical reasoning.

3 Lesson 1-3 Example 4 1-3 SolveWrite the ratio of brown-eyed students to the total students. Think: The ratio of the total number of students to the total number of students is.

4 Lesson 1-3 Example 4 1-3 The probability of choosing a student who does not have brown eyes is the same as the difference of the ratio of the entire class and the ratio of brown-eyed students. The probability for choosing a student who does not have brown eyes is.

5 Lesson 1-3 Example 4 1-3 CheckCheck your answer. The sum of the probability that an event occurs and probability that the event does not occur is 1. Is the sum of your probabilities equal to one? Explain.

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