16. Personnel records of a large hospital show that 10 percent of housekeeping and maintenance employees quit

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16. Personnel records of a large hospital show that 10 percent of housekeeping and maintenance employees quit within one year after being hired. If 10 new employees have just been hired:

a. What is the probability that exactly half of them will still be working after one year?

b. What is the probability that all will be working after one year?

c. What is the probability that 3 of the 10 will quit before the year is up?

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