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61% of all violent felons in the prison system are repeat offenders. If 30 violent felons...

61% of all violent felons in the prison system are repeat offenders. If 30 violent felons are randomly selected, find the probability that  


a. Exactly 18 of them are repeat offenders.
b. At most 17 of them are repeat offenders.
c. At least 19 of them are repeat offenders.  
d. Between 15 and 20 (including 15 and 20) of them are repeat offenders.

Math   Statistics-And-Probability   
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