If P(A)=0.3, P(B)=0.6, and P (AandB)=0.1, find P(AorB).
asked Apr 4, 2011 in Algebra 1 Answers by anonymous

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2 Answers

P(A||B) = P(A)+P(B)-P(A&&B)
answered Apr 4, 2011 by HenryYang Level 3 User (2,140 points)

 

Innocent until proven guilty? In Japanese criminal trials, about 95% of the defendants are found guilty. In the United States, about 60% of the defendants are found guilty in criminal trials†. Suppose you are a news reporter following five criminal trials.
(a) If the trials were in Japan, what is the probability that all the defendants would be found guilty? (Round your answer to three decimal places.)
  
 
   0.774  
 
What is this probability if the trials were in the United States? (Round your answer to three decimal places.)
  
 
 
(b) Of the five trials, what is the expected number of guilty verdicts in Japan? (Round your answer to two decimal places.)
  verdicts
 
What is the expected number in the United Sates? (Round your answer to two decimal places.)
  verdicts
 
What is the standard deviation in Japan? (Round your answer to two decimal places.)
  verdicts
 
What is the standard deviation in the United States? (Round your answer to two decimal places.)
  verdicts
answered Mar 25, 2013 by anonymous
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