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Tim Wong
Attended Bryant University
Lives in San Francisco, CA
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Tim Wong

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In a forest, 20% of the mushrooms are red, 50% of the mushrooms are green, and 30% of the mushrooms are white. The red mushrooms have a 20% probability of being poisonous, while the non-red mushrooms have a 5% probability of being poisonous. What is the probability that a poisonous mushroom is red?
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picking a mushroom at random, probability that mushroom is red = 20%
picking a mushroom at random, probability that mushroom is not red = 80%

picking a mushroom at random, probability that mushroom is red AND poisonous = 20% * 20% = 4%
picking a mushroom at random, probability that mushroom is not red AND poisonous = 80% * 5% = 4%

picking a mushroom at random, probability that mushroom is (red OR not red AND) poisonous = 4% + 4% = 8%

(probability of picking a poisonous red mushroom) / (probability of picking any poisonous mushroom) = 4% / 8% = 50%

answer = 50%
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Tim Wong

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Nah, actually the driver and passenger were in costumes...."Batman and Robin", at least they had mask, not sure what was going on under, lol.
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Tim Wong

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This Frenchman is wearing a Tweetee t-shirt! :-)
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Birthday cake.
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"Carmunicate" is a website that lets drivers communicate with other drivers. Your license plate is your username. http://www.carmunicate.us
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"Carmunicate" is a website that lets drivers communicate with other drivers. Your license plate is your username.
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Eight Eighteen
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Extraverting. Sensing. Thinking. Judging. Consider yourself forewarned.
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San Francisco, CA
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Boston, MA
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  • Bryant University
    Computer Science, 1999 - 2003
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Tim Wong's +1's are the things they like, agree with, or want to recommend.
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