Answered: The probability that a person is smart…

The probability that a person is smart or thirsty is 0.7. The probability that they are smart or not thirsty is 0.9. What is the probability that a randomly selected person is smart?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

The probability that a person is smart or thirsty is 0.7. The probability that they are smart or not thirsty is 0.9. What is the probability that a randomly selected person is smart?

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given data

event A : smart person

B : thirsty person

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Follow-up Questions

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Follow-up Question

Confused as to where/how you derived p(A∪B') = P(A) + P(A'∩B'). Am I missing something from a thereom?

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