AT&T; 12:47 PM webassign.net last submission is used for your score. Does crime

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AT&T; 12:47 PM webassign.net last submission is used for your score. Does crime pay? The FBI Standard Survey of Crimes showed that for about 80% of all property crimes (burglary, larceny, car theft, etc.), the criminals are never found and the case is never solvedt. Suppose a neighborhood district in a large city suffers repeated property crimes, not always perpetuated by the same criminals. The police are investigating six property crime cases in this district. (a) What is the probability that none of the crimes will ever be solved? (Round your answer to three decimal places.) (b) What is the probability that at least one crime will be solved? (Round your answer to three decimal places.) (c) What is the expected number of crimes that will be solved? (Round your answer to two decimal places.) crimes What is the standard deviation? (Round your answer to two decimal places.) crimes (d) How many property crimes n must the police investigate before they can be at least 90% sure of solving one or more cases? nE crimes e View Previous Question Question 10 of 13 View Next Question > Home My Assignments Extension Request

Explanation / Answer

a)P(none of the crimes ever be solved) =(0.8)6=0.262

b)P(at least one) =1-P(none) =1-0.262 =0.738

c) expected number =np =6*0.2 =1.2

d) std deviation =(np(1-p))1/2 =0.98

e)probability to solve at least >0.9

solving above n=11

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