Chapter 11 L11-4 Notes: Probability and Area. The probability of landing in a specific region of a target is the ratio of the area of the specific region.

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Chapter 11 L11-4 Notes: Probability and Area

The probability of landing in a specific region of a target is the ratio of the area of the specific region to the area of the target.

Example 1 Find the probability that a randomly thrown dart will land in the shaded region of the dartboard.

Example 2 Find the probability that a randomly thrown dart will land in the shaded region of each dartboard. If a dart is randomly thrown 400 times at the dartboard, about how many times will the dart land in the shaded region?

On Your Own… 1. Find the probability that a randomly thrown dart will land in the shaded region of the dartboard. 2. If a dart is randomly thrown 640 times at the dartboard, about how many times will the dart land in the shaded region?

Chapter 11 L11-5 Notes: Probability of Independent Events

Vocabulary Two or more events in which the outcome of one event does not affect the outcome of the other event are independent events. The probability of two independent events is found by multiplying the probability of the first event by the probability of the second event.

Example 1 A coin is tossed, and the spinner shown is spun. Find the probability of tossing heads and spinning a 3.

Example 2 Amanda placed 2 red marbles and 6 yellow marbles into a bag. She selected 1 marble without looking, replaced it, and then selected a second marble. Find the probability that each marble selected was not yellow.

On Your Own… A coin is tossed and a number cube is rolled. Find the probability of each event. 1. P(tails and even) 2. P(heads and less than five)