An office has 4 phone lines each is busy about 10 of the


An office has 4 phone lines. Each is busy about 10% of the time. Assume that the phone lines act independently.

a. What is the probability that all 4 phones are busy?

b. What is the probability that 3 of the phones are busy?

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Mathematics: An office has 4 phone lines each is busy about 10 of the
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