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Probability: Joe is a fool with probability 0.6, a thief with probability 0.7, and neither with probability 0.25. Determine the probability that he is a fool or a thief but not both.
 one year ago
 one year ago
Probability: Joe is a fool with probability 0.6, a thief with probability 0.7, and neither with probability 0.25. Determine the probability that he is a fool or a thief but not both.
 one year ago
 one year ago

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apple_piBest ResponseYou've already chosen the best response.0
What is probability of Joe being not a thief. Similarly what is probability of not being a fool?
 one year ago

windsylphBest ResponseYou've already chosen the best response.0
My answer is 0.2, since the probability of Joe being a thief, a fool, or both a thief and a fool is 10.25 = 0.75, and 0.75 = P(Joe is thief) + P(Joe is fool)  P(Joe is thief and fool) = 0.6 + 0.7  x. x = 0.55, and (0.6 + 0.7)  0.55 = 0.2, which is the probability of Joe being a thief or a fool but not both. Please confirm?
 one year ago

windsylphBest ResponseYou've already chosen the best response.0
wait, I meant 0.75  0.55, not 0.6 + 0.7  0.55
 one year ago

windsylphBest ResponseYou've already chosen the best response.0
because 0.75 is already thief, fool, or both, and 0.55 is only both, so if i subtract 0.55 from 0.75, I get thief OR fool, right?
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
Ok first off, when we 'add' probabilities so like P(THIS and THAT) we multiply P(THIS) and P(THAT) The way I would do it is get P(fool but not thief) + P(thief but not fool)
 one year ago

windsylphBest ResponseYou've already chosen the best response.0
Sorry, for not being proper, but how would I get P(fool but not thief) and P(thief but not fool) if the event that Joe is a thief and Joe is a fool overlap?
 one year ago

apple_piBest ResponseYou've already chosen the best response.0
OK to get P(fool not thief) get P(fool) = 0.6, P(not thief) = 1 P(thief) = 0.3 now multiply the two to get P(fool not thief). Do similarly for the other one. Then just add the two probabilities. Sorry but I have to go now.
 one year ago

windsylphBest ResponseYou've already chosen the best response.0
It's okay, thank you for your help.
 one year ago
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