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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 solved†. Suppose a neighborhood district in a large city suffers repeated property crimes, not always perpetrated 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 to three decimal places.)
(b) What is the probability that at least one crime will be solved? (Round to three decimal places.)
(c) What is the expected number of crimes that will be solved? (Round to two decimal places.) crimes
What is the standard deviation? (Round 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? n = crimes
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