SOLUTION: Out of 50 people, 31 drink tea, 20 drink coffee, and 6 drink both tea AND coffee. What is the probability that a person who is chosen randomly drinks tea OR coffee?

Algebra ->  Probability-and-statistics -> SOLUTION: Out of 50 people, 31 drink tea, 20 drink coffee, and 6 drink both tea AND coffee. What is the probability that a person who is chosen randomly drinks tea OR coffee?      Log On


   

Question 1180896: Out of 50 people, 31 drink tea, 20 drink coffee, and 6 drink both tea AND coffee.
What is the probability that a person who is chosen randomly drinks tea OR coffee?
Answer by ikleyn(52799) About Me  (Show Source):
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Out of 50 people, 31 drink tea, 20 drink coffee, and 6 drink both tea AND coffee.
What is the probability that a person who is chosen randomly drinks tea OR coffee?
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    P(tea OR coffee) = P(tea) + P(coffee) - P(tea AND coffee) = 31%2F50+%2B+20%2F50+-+6%2F50 = %2831%2B20-6%29%2F50 = 45%2F50 = 9%2F10 = 90%2F100 = 0.9 = 90%.    ANSWER

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