7) Parole USA Today reports that about 30% of all prison parolees become repeat offenders. Alice is a social worker whose job is to counsel people on parole. Let us say success means a person does not become a repeat offender. Alice has been given a group of four parolees. a) Find the probability of exactly 2 successes. b) What is the expected number of parolees in Alice's group who will not be repeat offenders? What is the standard deviation?

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