• Box 0 contains 3 maroon balls and 7 gold balls. • Box 1 contains 3 maroon balls and 7 gold balls. • Box 2 contains 7 maroon balls and 3 gold balls. uppose that Barbara selects a ball by first flipping two fair coins. If she gets 0 hea

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Barbara has three boxes. She's a computer scientist, so she numbers her boxes starting with 0.
• Box 0 contains 3 maroon balls and 7 gold balls.
• Box 1 contains 3 maroon balls and 7 gold balls.
• Box 2 contains 7 maroon balls and 3 gold balls.
Suppose that Barbara selects a ball by first flipping two fair coins. If she gets 0 heads, she chooses box 0. If she gets 1 head, she choose box 1. If she gets 2
heads, she chooses box 2. Once she has selected a box, she draws one ball out of the box (each ball equally likely to be drawn).
What is the probability that Barbara selects a gold ball?
If Barbara selects a ball from Box 1, what is the probability that that ball will be gold?
If Barbara selects a gold ball, what is the probability that it came from Box 1?
Transcribed Image Text:Barbara has three boxes. She's a computer scientist, so she numbers her boxes starting with 0. • Box 0 contains 3 maroon balls and 7 gold balls. • Box 1 contains 3 maroon balls and 7 gold balls. • Box 2 contains 7 maroon balls and 3 gold balls. Suppose that Barbara selects a ball by first flipping two fair coins. If she gets 0 heads, she chooses box 0. If she gets 1 head, she choose box 1. If she gets 2 heads, she chooses box 2. Once she has selected a box, she draws one ball out of the box (each ball equally likely to be drawn). What is the probability that Barbara selects a gold ball? If Barbara selects a ball from Box 1, what is the probability that that ball will be gold? If Barbara selects a gold ball, what is the probability that it came from Box 1?
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