48% of all violent felons in the prison system are repeat offenders. If 45 violent felons are randomly selected, find the probability that
a. Exactly 20 of them are repeat offenders. _____
b. At most 21 of them are repeat offenders. ______
c. At least 22 of them are repeat offenders. _____
d. Between 19 and 23 (including 19 and 23) of them are repeat offenders._____
(Discrete probability and the binomial distribution)
The solution to this problem is given by
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