(1) The probability of smoke is .4, and the probability of fire is .8, and it is well-known that P(fire|smoke) = 1 ("there's no smoke without fire"). (a) Draw a Venn diagram with events S (Smoke) and F (Fire) that illustrates that P(F|S) = 1. Label all non-overlapping regions with their probabilities. (b) Find the probability of fire given that there is no smoke. (c) Find P(S|F). (d) Find the probability that there is neither smoke nor fire.

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Chapter1: Combinatorial Analysis
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Please answer (1) and (2).

(1) The probability of smoke is .4, and the probability of fire is .8, and it is well-known that
P(fire|smoke)
= 1 (“there's no smoke without fire").
(a) Draw a Venn diagram with events S (Smoke) and F (Fire) that illustrates that
P(F\S) = 1. Label all non-overlapping regions with their probabilities.
(b) Find the probability of fire given that there is no smoke.
(c) Find P(S|F).
(d) Find the probability that there is neither smoke nor fire.
Someone comes in to my house. Let R be the event that this person is a burglar. Let D
be the event that my dog barks. My dog barks at burglars at with probability 9/10, and
my dog barks at non-burglars with probability 1/2. Assume that P(R) = 1/5. If my dog
barks at the person who comes in, what is the probability that the person is a burglar?
Transcribed Image Text:(1) The probability of smoke is .4, and the probability of fire is .8, and it is well-known that P(fire|smoke) = 1 (“there's no smoke without fire"). (a) Draw a Venn diagram with events S (Smoke) and F (Fire) that illustrates that P(F\S) = 1. Label all non-overlapping regions with their probabilities. (b) Find the probability of fire given that there is no smoke. (c) Find P(S|F). (d) Find the probability that there is neither smoke nor fire. Someone comes in to my house. Let R be the event that this person is a burglar. Let D be the event that my dog barks. My dog barks at burglars at with probability 9/10, and my dog barks at non-burglars with probability 1/2. Assume that P(R) = 1/5. If my dog barks at the person who comes in, what is the probability that the person is a burglar?
Expert Solution
Step 1

Since you have submitted two questions, we'll answer the first question. 
For the second question please submit the question again and specify it.

 

1) Given that P(F)=0.8, P(S)=0.4, P(F|S)=1

So the Venn diagram is:

Probability homework question answer, step 1, image 1

 

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