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 perpetuated by the same criminals. The police are investigating seven 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

Community Answer

Ansaver:(1) Each crime has 20% chance of being selved They want to une Binomial ThearemP[x)=^(n)c_(x)p^(n)(1-10)^(n-x)Where p is probability of solving crime, n is number of crimes and x is thearetical number ofp=0.2,n=3,x=0then{:[P[X=0]=^(3)C_(0)(0.2)^(0)(0.8)^(3-0)],[=(0.8)^(3)=0.512]:}(2) Similar to above We here to ... See the full answer